INSTRUCTION MANUAL FOR AIR CIRCUIT BREAKERS (With Draw-out Cradle and Type AGR-31B Overcurrent Protective Device)

Transcription

1 INSTRUCTION MANUAL FOR AIR CIRCUIT BREAKERS (With Draw-out Cradle and Type AGR-31B Overcurrent Protective Device) Types: AR650S,AR663S,AR663H Notice Be sure to read this manual before installing, operating, servicing, or inspecting the ACB. Please retain this manual for future reference. Electrical work must be done by competent persons. ACB maintenance, inspection, parts replacement, OCR field tests and setting changes must be performed by competent persons.

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3 TABLE OF CONTENTS 1. SAFETY NOTICES 5 2. RECEIVING AND HANDLING Transportation Precautions Transporting the ACB Transporting the breaker body Transporting the draw-out cradle Storage Precautions Installation Precautions GENERAL Types and Descriptions Parts and Functions Circuits and Ratings OPERATION Charging and Opening operation Charging operation Closing operation Opening operation Motion of trip indication and spring charge indication switches Motion of operation mechanisms Draw-out and Insertion Operation General Draw-out operation Putting the breaker body back into the draw-out cradle Contact status of auxiliary and position switches ON-OFF Button Cover Locking Procedure Lock in OFF Procedure Position Lock Lever Locking Procedure Breaker Fixing Bolt Securing Procedure OCR Cover Locking Procedure OVERCURRENT RELEASE (OCR) Specifications Characteristics L characteristic for general feeder R characteristic for general feeder S characteristic for generator protection How to Display Measurements and Make Settings General Available screens Monitor 1 screen Monitor 2 screen Setup screen Reset screen Setting 1 screen Setting 2 screen Maintenance screen OCR Function Check Operation Indication and Indication Resetting Procedure MAINTENANCE, INSPECTION AND PARTS REPLACEMENT Inspection Procedures Parts Replacement Procedure Preparation Arc chambers Stationary arc contact and moving arc contact Latch release coil (LRC) Shunt trip device (SHT) Control relay Magnet hold trigger (MHT) Auxiliary switches TROUBLESHOOTING FLOWCHARTS 83

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5 1. SAFETY NOTICES Thank you for purchasing the TERASAKI AR-series Air Circuit Breaker (TemPower2). This chapter contains important safety information.7 Be sure to carefully read these safety notices, instruction in this manual, and other documents accompanying the Air Circuit Breaker (hereinafter referred to as the ACB) to familiarize yourself with safe and correct procedures or practices before installing, operating, or servicing the ACB. In this manual, safety notices are divided into DANGER and CAUTION according to the hazard level: DANGER : A danger notice with this symbol indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury. CAUTION : A caution notice with this symbol indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury and/or property damage. Note that failure to observe a caution notice could result in serious injury/damage in some situations. Because safety notices contain important information, be sure to read and observe them. Transportation Precaution DANGER Never stand under the ACB that has been lifted or suspended by a lifter or lifting attachments. The weight of the ACB may cause serious injury. Installation Precautions CAUTION Electrical work must be done by competent persons. Do not place the ACB in such an area that is subject to high temperatures, high humidity, dusty air, corrosive gases, strong vibration and shock, or other unusual conditions. Mounting the ACB in such an area could cause a fire or malfunction. Be careful to prevent foreign objects (such as debris, concrete powder, dust, chippings, and iron powder) and oil or rainwater from entering the ACB. These materials inside the ACB could cause a fire or malfunction. Prior to commencing any work on the ACB, open an upstream circuit breaker or the like to isolate all sources of power/voltage. Otherwise, electric shock may result. Fix the draw-out cradle of the ACB firmly on a flat, level surface using mounting screws. Otherwise, the draw-out operation may cause the breaker body or the draw-out cradle to fall, resulting in damage to the ACB or personal injury. Lower the breaker body onto a flat, level surface. Otherwise, the breaker body to fall, resulting in damage to the ACB personal injury. Take care not to deform or bend protrusions in the bottom face of the draw-out cradle when fixing the draw-out cradle with mounting screws. Deformation of the protrusions may cause a malfunction. Connect conductors (including screws) to the main circuit terminals in the specified area. Otherwise, a short-circuit may result. When terminating conductors to the ACB, tighten terminal screws to the torque specified in this manual. Otherwise, a fire could result. For 4-pole ACBs, be sure to connect a 3-phase, 4-wire neutral conductor to the N-phase pole (on the right end). Otherwise, an overcurrent may hinder the ACB from tripping, resulting in a fire. Operation Precautions DANGER Never touch live terminal parts. Doing so will result in electric shock. Do not leave the ACB body in the draw-out position. If the ACB body is accidentally dropped, its weight may cause serious injury. 5

6 Operation Precautions (continued) CAUTION Repeated open/close operation by the motor charging mechanism without pause should not exceed 15 times. If repeated continuous open/close operation is inevitable, a pause of at least 20 minutes should be provided after the repetitions of 15 times. Otherwise, a spring charging motor may be burnt out. Do not bring your hand or face close to arc gas vent of the arc chamber while the ACB is closed. Otherwise, a burn may result from high-temperature arc gas blowing out of the arc gas vent when the ACB trips open. If the ACB trips open automatically, remove the cause of tripping operation before re-closing the ACB. Otherwise, a fire could result. If the ACB has the breaker fixing bolts, be sure to loose the fixing bolts before draw-out operation. Otherwise, damage to the ACB may result. Make sure the draw-out cradle is secured with mounting screws before inserting or drawing out the breaker body. Otherwise, the insertion or draw-out operation may cause the breaker body or the draw-out cradle to fall, resulting in damage to the ACB or personal injury. When retracting the draw-out rail into the draw-out cradle, be sure to push the rail end. Do not hold the hook pin, body stopper, or body stopper shaft. Doing so may cause your fingers to be pinched, resulting in injury. Do not forcedly turn the draw-out handle clockwise when the breaker body is in the CONN. position. Doing so may cause a malfunction. If the ACB has the breaker fixing bolts, make sure the bolts on both sides are securely tightened before using the ACB. Loosened fixing bolts may cause a malfunction of the ACB, in particular when it is installed in such an area that is subject to strong vibrations. OCR (Overcurrent Release) Handling Precautions CAUTION OCR field tests and setting changes must be performed by competent persons. After setting changes are made, the settings be checked with e.g., a type ANU-1 OCR checker (optional). After completion of OCR tests, be sure to return the settings to the original values. Failure to do so may cause a fire or burnout. Before changing OCR settings, open the ACB and then lock the OFF button to prevent the ACB from being closed inadvertently. Do not push the SET button diagonally. Doing so may cause a poor in return and malfunction. Maintenance and Inspection Precautions CAUTION ACB maintenance, inspection and parts replacement must be performed by competent persons. Do not touch ACB current carrying parts and ACB structural parts close to a current carrying part immediately after the ACB trips open. Remaining heat may cause a burn. Prior to commencing any work on the ACB, open an upstream circuit breaker or the like to isolate all sources of power/voltage from the main and control circuits. Otherwise, electric shock may result. Take care to avoid adhesion of dust to main and control circuit contacts. Dust on the contacts may result in a fire. Prior to commencing maintenance, inspection, or parts replacement, make sure that the closing springs are released and the ACB is open. Otherwise, unintentional open/close operation may lead to fingers or tools to be pinched by the open/close mechanism, resulting in injury. Retighten the terminal screws periodically to the specified torque. Otherwise, a fire could result. When grinding a contact tip, be careful to prevent grinding dust from entering the breaker operating mechanism. Wipe the tip clean after grinding. Otherwise, a malfunction or fire could result. Do not perform dielectric withstand tests under other conditions than specified. Doing so may cause a malfunction. Be sure to reinstall the arc chamber if removed. Failure to do so or incorrect installation of the arc chamber may result in a fire or burn. When charging the closing springs or performing open/close operation of the ACB with the arc chamber, front cover and/or side covers removed during maintenance or inspection work, do not touch parts other than those required for the above operation (charging handle, ON/OFF buttons, moving core and the like). Doing so may cause fingers or tools to be pinched, resulting in injury. When replacing an auxiliary, do not damage the control wire for the auxiliary or pinch the wire between the auxiliary and the breaker body. Doing so may cause a malfunction. 6

7 2. RECEIVING AND HANDLING Upon receipt of your ACB, check the following. If you have any question or problem, contact us at the indicated on the back cover of this manual. Check that the ACB received is as ordered and that the accessories are as specified. Check that the ACB is not damaged during shipment Transportation Precautions DANGER Never stand under the ACB that has been lifted or suspended by a lifter or lifting attachments. If the ACB body is accidentally dropped, its weight may cause serious injury Transporting the ACB Before transporting the ACB, make sure the breaker body is in the CONN. position. If the ACB has breaker fixing bolts, make sure the breaker body is secured to the draw-out cradle with the fixing bolts. When lifting the ACB, hold it using lifting attachments or wire ropes through the lifting holes. Take care that the position switches, control circuit terminals, auxiliary switches, arc gas barrier and control terminal block cover which are shown in Fig. 1 are not damaged by the lifting rope. Lift the ACB carefully and gently. For transportation, place the ACB on a pallet and carry slowly and carefully. Avoid shock and vibration to the ACB during transportation. Do not lay the ACB during transportation. When transporting the ACB over great distances, crate it for protection against shock and vibration and secure the crate package with wood or ropes. When transporting the ACB while it is installed in a switchboard, you should fix the breaker body in the draw-out cradle with the breaker fixing bolts (optional). Lower the ACB onto a flat, level surface. Control circuit terminals Auxiliary switches Breaker body *When lifting the ACB, the length of the rope do not be beyond the range of the angle to show in figure. Breaker fixing bolt Front view Rope Control terminal block cover Lifting hole (ø20mm) Arc gas barrier Draw-out arm Rear view Fig. 1 Transporting the ACB ACB Lifting attachment 7

8 Transporting the breaker body Use an optional lifter or lifting plate to transfer the breaker body. When transporting the breaker body on a lifter, move the lifter with the lifter fork held at the lowest possible position. Take care not to exert forces on the front cover and the control circuit contacts shown in Fig. 2. Otherwise, a deformation or damage may result. Lifting plate Front cover Front view Control circuit contact Rear view Rope Lifting plate *When lifting the breaker body, the length of the rope do not be beyond the range of the angle to show in figure. Breaker body Lifting attachment Fig. 2 Transporting the breaker body 8

9 Transporting the draw-out cradle When transporting the draw-out cradle, hold it using lifting attachments or wire ropes through the lifting holes or carry it by the portions (4 points) marked with the arrows shown in Fig 3. When carrying the draw-out cradle, take care not to exert forces on the arc gas barrier, the draw-out arm, the auxiliary switches, the control circuit terminals, the control terminal block cover, and the control circuit contacts. Control circuit terminals Auxiliary switches Control circuit contacts Front view Control terminal block cover Arc gas barrier Lifting hole (ø20mm) Draw-out arm Rear view Rope *When lifting the draw-out cradle, the length of the rope do not be beyond the range of the angle to show in figure. Draw-out cradle Lifting attachment Fig. 3 Transporting the draw-out cradle 9

10 2-2. Storage Precautions It is recommended that the ACB be used as soon as you have received it. If it is necessary to store the ACB, note the following: Store the ACB in a dry indoor location to prevent condensation due to sudden changes in ambient temperature. Condensation has a harmful effect on the ACB insulation. Store the ACB in a clean place free of corrosive gases and dust. In particular, exposure to a mixture of moisture and cement dust may cause corrosion damage to metal parts of the ACB. Place the ACB on a flat, level surface in its normal position (Do not lay the ACB). Do not place the ACB directly on the floor. Do not stack the ACBs during storage Installation Precautions CAUTION Electrical work must be done by competent persons. Do not place the ACB in such an area that is subject to high temperatures, high humidity, dusty air, corrosive gases, strong vibration and shock, or other unusual conditions. Mounting the ACB in such an area could cause a fire or malfunction. Be careful to prevent foreign objects (such as debris, concrete powder, dust, chippings, and iron powder) and oil or rainwater from entering the ACB. These materials inside the ACB could cause a fire or malfunction. Prior to commencing any work on the ACB, open an upstream circuit breaker or the like to isolate all sources of power/voltage. Otherwise, electric shock may result. Fix the draw-out cradle of the ACB firmly on a flat, level surface using mounting screws. Otherwise, the draw-out operation may cause the breaker body or the draw-out cradle to fall, resulting in damage to the ACB or personal injury. Take care not to deform or bend protrusions in the bottom face of the draw-out cradle when fixing the draw-out cradle with mounting screws. Deformation of the protrusions may cause a malfunction. (see Fig. 4) Connect conductors (including screws) to the main circuit terminals in the specified area. Otherwise, a short-circuit may result. When terminating conductors to the ACB, tighten terminal screws to the torque specified in this manual. Otherwise, a fire could result. For 4-pole ACBs, be sure to connect a 3-phase, 4-wire neutral conductor to the N-phase pole (on the right end). Otherwise, an overcurrent may hinder the ACB from tripping, resulting in a fire. Draw-out cradle mounting screw hole Draw-out cradle mounting screws Hex head M12 (4) (not supplied) with spring washer, flat washers (2) and nut Tightening torque: N m Protrusion Fig. 4 Protrusion on the bottom of the draw-out cradle Do not install the ACB in such an area that is exposed to direct sunlight. Make sure that the mounting base has a sufficient capacity of bearing the weight of the ACB (see Table 3 and Table 4). The mounting base must be protected against vibration. Take appropriate measures to provide a perfect protection to the mounting base against resonance. Otherwise, open/close operation of the ACB may cause a malfunction of other devices in the switchboard or vibrations of the switchboard may cause a malfunction of the ACB. 10

11 Use the following screws with appropriate length for the main circuit terminals. Main circuit terminal screws: Hex head M10, with flat washers (2), spring washer (1) and nut (1) per screw Tightening torque: N m Table 1 Number of main circuit terminal screws required ACB type AR650S, AR663S, AR663H Number of main circuit Vertical terminals 48/64 terminal screws (3/4-pole) Horizontal terminals* 36/48 Use the following screw for the ground terminal. The screw must have a length that allows it to be inserted 4-9 mm into the ground terminal M8 tapped hole. Ground terminal screw: M8 (1) with spring washer and flat washer Tightening torque: N m Connect conductors to the main circuit terminals in the conductor connection area as shown in Fig. 5. Vertical terminals, 3 Poles Right side view Back view Vertical terminals, 4 Poles Right side view Back view Fig. 5 Conductor (include screw) connection area 11

12 Use a support to hold conductors securely at distance L as shown in Fig. 6 and Table 2. Such a support will help preventing the conductors and main circuit terminals from being deformed or damaged due to a large electromagnetic force caused by any fault current. Use a high-quality insulating material for a support and secure enough insulation distance. Table 2 Distance L Short-circuit current (ka) Distance Type AR650S,663S,663H L (mm) Support Conductor Conductor ACB Support ACB Fig. 6 Support mounting The following procedure makes it easy to make connections with screw terminals of position switches, control circuit terminals, and auxiliary switches. (1) Draw out the breaker body to the removed position, and remove it using an optional lifter or lifting plate. Refer to sections and (2) If the ACB is equipped with the control terminal block cover, loosen both the cover fixing screws and remove the cover. (3) Remove the control circuit terminals fixing screws shown in Fig. 7. Control circuit terminals fixing screw Pan head M4 x 8 (2) (red), with spring and flat washer Tightening torque: N m Control circuit terminals Fig. 7 Terminal block fixing screws (4) Remove the terminal block fixing screws shown in Fig. 8. Auxiliary switches Terminal block fixing screws Hex head M6 x 10 (4) (red), with spring washer and flat washer Tightening torque: N m Fig. 8 Terminal block fixing screws 12

13 (5) Tilt the terminal block down as shown in Fig. 9. After connecting wires, tilt the terminal block up again and fix it with the terminal block fixing screws. Auxiliary switch terminal screw (Control terminal screw) (Position switch terminal screw) Pan head M4 x 8, with spring washer and terminal washer Tightening torque: N m Fig. 9 Terminal block tilted down Connect the control wire to a com. terminal as shown in Fig. 10. Small flat-blade screwdriver * If the gap above the com. terminal is too small to insert the screwdriver, unscrew the two communication terminal block mounting screws (pan head M4 8, red, with spring and flat washers), remove the terminal block, connect the control wire and reinstall the terminal block. The tightening torque of the mounting screws is N m. 8-9mm Fig. 10 Com terminal connection Com. terminals Control wire Cross sectional area of the control wire: 1.5 mm 2 (AWG16) If any work is done near the ACB that have been installed, protect the openings of the ACB with appropriate covers to prevent spatters, metal chips, wire cuttings or other foreign objects from entering the ACB. 13

14 3. GENERAL 3-1. Types and Descriptions TemPower2 is available in types shown in Tables 3 and 4. Table 3 Standard types Frame size (A) Type AR650S AR663S Max. rated current [I n ] (A) *1 IEC, EN, AS Marine use 6300 N-phase rated current (A) Number of poles *2, * Dielectric withstand voltage [U i ] (50/60Hz) Operating voltage [U e ] (50/60Hz) Rated breaking/making current [ka sym rms/ka peak] AC 690V *5 85/187 IEC,EN, AS [I CS = I CU ] AC 500V JIS C Ann.1 Ann.2 120/264 AC 440V NK *4 AC 690V 85/201 AC 450V 120/287 For DC DC 600V *6 DC 250V 40/40 Rated short-time current [I CW ] [ka rms] 1 sec sec. 85 Rated latching current (ka) 120 With maintenance Mechanical Endurance Without maintenance 5000 in number of ON- Without AC 460V 1000 OFF cycles *7 Electrical maintenance AC 690V 500 Installation Draw-out type Mass (kg) External dimensions (mm) a b 460 c 380 d 60 Connection method Line side Vertical terminals Load side Vertical terminals Control circuit terminal type screw terminals Spring charging method Manual or motor charging Overcurrent release (OCR) No OCR, or L-characteristic for general feeder protection Operation indication Group indication Tripping coil (TC) Standard equipment for OCR-equipped ACB Tripping device Shunt trip device (SHT) Optional undervoltage trip device (UVT) Optional 4C (standard), 7C or 10C; available for general feeder or Number of switches Auxiliary switches microload Terminal type screw terminals Rated voltage Operation power AC V, AC V, DC V, DC V, DC24V or DC48V *1: Ambient temperature: 40 C (45 C for marine used)) *2: For 2-pole applications, use two poles at both ends. *3: 4-pole ACBs are not applicable to power distribution IT systems unless N-phase protection is provided. *4: Applicable to 3-pole ACBs *5: For applicability to power distribution IT systems, consult us *6: Applicable under 3-pole serial connection scheme. *7: Expected service life based on endurance test. The service life of ACB depends on the working and environmental conditions. Refer to chapter 6 Maintenance, Inspection and Parts Replacement. 14

15 Table 4 High-performance types Frame size (A) 6300 Type AR663H Max. rated current [I n ] (A) *1 IEC, EN, AS 6300 Marine use 6300 N-phase rated current (A) 6300 Number of poles *2, *3 3 4 Dielectric withstand voltage [U i ] (50/60Hz) 1000 Operating voltage [U e ] (50/60Hz) 690 Rated breaking/making current [ka sym rms/ka peak] *4 AC 690V *6 85/187 IEC,EN, AS [I CS = I CU ] AC 500V AC 440V 135/297 NK *5 AC 690V 85/201 AC 450V 138/322 For DC DC 600V *7 DC 250V 40/40 Rated short-time current [I CW ] [ka rms] 1 sec sec. 85 Rated latching current (ka) 120 With maintenance Mechanical Endurance Without maintenance 5000 in number of ON- OFF cycles *8 Electrical Without maintenance AC 460V 1000 AC 690V 500 Installation Draw-out type Mass (kg) for draw-out type External dimensions (mm) a b 460 c 380 d 60 Connection method Line side Vertical terminals Load side Vertical terminals Control circuit terminal type screw terminals Spring charging method Manual or motor charging Overcurrent release (OCR) No OCR, or L-characteristic for general feeder protection Operation indication Group indication Tripping coil (TC) Standard equipment for OCR-equipped ACB Tripping device Shunt trip device (SHT) Optional Undervoltage trip device (UVT) Optional 4C (standard), 7C or 10C; available for general feeder Number of switches Auxiliary switches or microload Terminal type screw terminals Rated voltage Operation power AC V, AC V, DC V, DC V, DC24V or DC48V *1: Ambient temperature: 40 C (45 C for marine used) *2: For 2-pole applications, use two poles at both ends. *3: 4-pole ACBs are not applicable to power distribution IT systems unless N-phase protection is provided. *4: Setting the instantaneous trip function to NON reduces the rated breaking current to the rated latching current. *5: Applicable to 3-pole ACBs *6: For applicability to power distribution IT systems, consult us *7: Applicable under 3-pole serial connection scheme. *8: Expected service life based on endurance test. The service life of ACB depends on the working and environmental conditions. Refer to chapter 6 Maintenance, Inspection and Parts Replacement. Use the ACBs in the environmental conditions specified in Table 5. Table 5 Operating environment Standard environment (Standard equipped ACBs) Special environment (Optional) Altitude Ambient temperature Humidity Vibration Shock Atmosphere Tropical environment package Cold environment package Corrosion-resistant package 2000 m max. -5 C to +45 C 45 to 85% rel. max. 0.7G max. 200 m/s 2 (20G) max. No excessive water vapor, oil vapor, dust, or corrosive gases. No sudden change in temperature and no condensation. Ammonia (NH 3 ): 0.5 ppm max, Hydrogen sulfide (H 2 S)/sulfur dioxide (SO 2 )/hydrogen chloride (HCl): 0.1 ppm max., Chlorine (Cl 2 ): 0.05 ppm max. Different from standard ACBs in that Ambient temperature: 60 C max. and Humidity: 95% rel. max. (no condensation) Different from standard ACBs in that Ambient temperature: -25 C min. for use and -40 C min. for storage (no condensation) Different from standard ACBs in that NH 3 : 50 ppm max, H 2 S: 10 ppm max., SO 2 /HCl: 5 ppm max., and Cl 2 : 1 ppm max. 15

16 Table 6 shows the dielectric withstand voltage and the insulation resistance of the ACBs. CAUTION Do not perform dielectric withstand/insulation resistance tests under other conditions than specified. Doing so may cause a malfunction. Table 6 Dielectric withstand voltage and insulation resistance Circuit Dielectric withstand voltage (50/60Hz) Impulse withstand voltage U imp Insulation resistance (DC500V Megger used) Main circuit Between poles, and terminal group and ground AC3500V 1 minute 12kV 300MΩ Auxiliary For general feeder Between terminal group and ground AC2500V 1 minute 6kV 100MΩ switches For microload Between terminal group and ground AC2000V 1 minute 4kV 100MΩ Control circuit Position switches Between terminal group and ground AC2000V 1 minute 4kV 100MΩ Overcurrent release Between terminal group and ground AC2000V 1 minute 4kV 100MΩ Undervoltage trip device, Reverse power trip device Between terminal group and ground AC2500V 1 minute 6kV 100MΩ Other accessories Between terminal group and ground AC2000V 1 minute 4kV 100MΩ The above data applies to new ACBs. Device terminals within ACBs are not covered. Use a DC500V Megger to measure the insulation resistance. Table 7 shows the internal resistance and power consumption of the ACBs. Table 7 Internal resistance and power consumption Type AR650S AR663S AR663H Frame size (A) DC internal resistance (mω) (for 1-pole ACB) AC power consumption (W) (for 3-pole ACB) Table 8 shows applicable current of the ACBs. The applicable current varies depending on the ambient temperatures. Table 8 Dependence of applicable current on ambient temperature Type AR650S AR663S AR663H Conductor size Standard Ambient t t t temperature ( C) IEC (standard ambient temperature) EN AS JIS C Ann.1 Ann (standard ambient temperature) NEMA,SG-3 ANSI C37.13 JEC (standard ambient temperature) Notes: The above values may vary depending on the switchboard configuration. 16

17 3-2. Parts and Functions Fig. 11 provides a general views of the ACB. Control terminal block cover 38 Front cover 19 ON-OFF cycle counter 16 Specification nameplate 22 OFF button 4 ON-OFF button cover 15 Lock-in-OFF plate 14 Overcurrent release (OCR) 18 OCR cover 17 Side cover 20 Breaker fixing bolt (red) 29 Position padlock lever 13 6 ON-OFF indicator 7 Charge indicator 39 Cover fixing screw 8 Charging handle 5 ON button 15 ON-OFF button cover 21 Rating nameplate 9 Position indicator 50 Draw-out handle Release button 12 Draw-out handle insertion hole 11 1 ACB Control circuit terminals 37 Control circuit contact 25 Main circuit contact Lifting hole (ø20mm, for ACB + Draw-out cradle) 48 Lifting hole (ø20mm, for Draw-out cradle) 40 Auxiliary switches 41 Terminal block Draw-out rail 30 Draw-out rail end 31 Rail stopper 35 Protrusion Body stopper 32 Hook pin 34 Body stopper shaft Specification nameplate 21 2 Draw-out cradle (front view) Fig General view and parts designation 17

18 Arc chamber 26 Main circuit contact Control circuit contact 27 Mold cover Mold base Breaker body roller 10 Grip 36 Transport roller 3 Breaker body (rear view) Gas exhaust port 43 Arc gas barrier 44 Main circuit terminal 46 Breaker draw-out arm 45 2 Draw-out cradle (rear view) 42 Ground terminal M8 tapped hole Fig General view and parts designation (rear view) 18

19 1 ACB Consists of breaker body 3 and draw-out cradle 2. 2 Draw-out cradle Comes with main circuit terminals 45, control circuit terminals 36, auxiliary switches Breaker body Contains the ON-OFF mechanism, the closing coil,the tripping device, and overcurrent release OFF button Push to open the ACB. 5 ON button Push to close the ACB. 6 ON-OFF indicator Shows OFF when the ACB is open and ON when it is closed. 7 Charge indicator Shows CHARGED when the closing springs are charged and DISCHARGED when it is released. 8 Charging handle Pump to charge the closing springs. 9 Position indicator Indicates the present breaker body position: CONN., TEST, or ISOLATED. 10 Grip Hold to draw out the breaker body. 11 Draw-out handle insertion hole Insert the draw-out handle into this hole to move the breaker body. 12 Release button Push to move the breaker body from the TEST position. 13 Accommodates up to three padlocks to lock the breaker body in the CONN., TEST or Position padlock ISOLATED position. (Padlocks are not supplied. Use padlocks with a 6 mm-diameter lever (optional) shackle.) Lock-in-OFF plate (optional) ON-OFF button cover ON-OFF cycle counter (optional) OCR cover Overcurrent release (OCR) Padlocking this plate allows the ACB to be locked in the open (OFF) state. (Padlocks are not supplied. Use padlocks with a 6 mm-diameter shackle.) Provides protection against inadvertent button operation and can be padlocked. (Padlocks are not supplied. Use padlocks with a 6 mm-diameter shackle.) Up to three padlocks can be installed. Reads the number of ON-OFF cycles. It counts a series of operations from close to open as one cycle. Padlocking this plate prevents settings of overcurrent release 18 to be inadvertently changed. (Padlocks are not supplied. Use padlocks with a 6 mm-diameter shackle.) This protective device is supplied power via the power CT installed in the ACB main circuit. When the current sensor detects an overcurrent in the main circuit, the OCR instructs the magnet hold trigger (MHT) to trip open the ACB. 19 Front cover A plastic cover of the breaker body front panel. 20 Side cover A metal cover of the breaker body front panel 21 Rating nameplate Indicates the type, applicable standards and rated breaking capacity of the ACB. 22 Specification Indicates the number of poles, operation method, accessories, and serial number of the nameplate ACB. 23 Breaker body roller Allows breaker body 3 to be moved on draw-out rail Main circuit contact Closes when the breaker body is in the CONN. position Control circuit contact Arc chamber Closes when the breaker body is in the CONN. or TEST position. Extinguishes the arc that occurs in the breaking operation. Two arc chambers are fitted per pole. See "Arc chambers". 27 Mold cover A plastic cover of the breaker body side face. 28 Mold base A plastic cover of the breaker body rear face. 29 Breaker fixing bolt Allows the breaker body to be locked in the CONN. position even if the ACB is subject to (red) (optional) strong vibrations. 30 Draw-out rail Use to draw out the breaker body from the draw-out cradle. 31 Draw-out rail end Refer to chapter 1 Operation Precautions. 32 Hook pin Refer to chapter 1 Operation Precautions. 33 Body stopper Prevents the breaker body from falling when the body is drawn out from the draw-out cradle. 34 Body stopper shaft Refer to chapter 1 Operation Precautions. 35 Rail stopper (red) Allows the draw-out rail to be locked in the drawn-out or retracted state. 36 Transport roller Allows breaker body 3 to be moved on horizontal surface. Breaker body moves to front and back. 19

20 37 Control circuit terminals Allow connections of external control wire to the control circuits. Wire connections are made through M4 screw terminals. Fig. 12 shows the control circuit terminals. Fig. 12 Control circuit terminals 38 Control terminal Protects the position switches, the control circuit terminals and the auxiliary switches from block cover (optional) damage. 39 Cover fixing screw Secures the control terminal block cover. 40 Indicate the state of the ACB (ON or OFF). The auxiliary switches are available in 4C Auxiliary switches configuration (standard), or 7C or 10C configuration (optional). Connections to the (optional) switches are made through M4 screw terminals. 41 Terminal block Contains position switches, control circuit terminals 36, and auxiliary switches Ground terminal M8 tapped hole Allows connection of a ground terminal. 43 Gas exhaust port Allows the arc gas to be discharged from arc chamber 26 in a horizontal direction when the ACB trips open. 44 Arc gas barrier Prevents the arc gas from being discharged upwards from arc chamber 26 when the ACB trips open. 45 Breaker draw-out arm Is retracted in the draw-out cradle when the breaker body is in the CONN. position. 46 Main circuit terminals Allow connections of external conductors. 47 Lifting hole (ø20mm, for ACB + Draw-out Allows lifting attachments or wire ropes to be used for lifting the ACB. cradle) 48 Lifting hole (ø20mm, for Draw-out cradle) Allows lifting attachments or wire ropes to be used for lifting the Draw-out cradle. 49 Protrusion Refer to section 2-3. Installation Precautions. 50 Draw-out handle (removable) Use to draw out /insert the breaker body from/into the draw-out cradle. 20

21 3-3. Circuits and Ratings Fig. 13 shows an ACB circuit diagram and Table 9 and Fig. 14 show the function of each terminal and the meaning of each sign in the diagram. Fig Breaker circuits 1 Table 9-1 Terminal functions and circuit symbols 1 (Applicable to both 50 and 60Hz for AC. and mean the polarity for DC) Function Terminal No. Remarks Circuit voltage Connect When compatible with both When compatible with both Terminal No. the unit to AC V and AC200 - DC V and DC200 - the 240V power *5 250V power *5 Control power supply 01, 11, 21 applicable AC V NA NA terminal Nos. When compatible with both DC24V and DC48V power * NA DC V DC24V AC V DC V DC48V Operation power AC V, AC V, DC V, DC V, DC24V or DC48V *5 ON switch Undervoltage trip device power 08, 09, 18, 28 Connect Circuit voltage Terminal No. the unit to AC100V compatible *5 AC200V compatible *5 AC400V compatible *5 the AC100V AC200V AC380V applicable AC110V AC220V AC415V terminal Nos AC120V AC240V AC440V OFF switch Available for ACBs equipped with undervoltage trip device Continuous-rated shunt trip device power and OFF switch Operation indication AC100V, AC110V, AC120V, AC200V, AC220V, AC240V, DC24V, DC48V, DC100V, DC110V, DC125V, DC200V or DC220V *5 Long time delay trip (LT) Short time delay (ST) and instantaneous trip (INST/MCR) Pretrip alarm (PTA) Ground fault trip (GF) or reverse power trip (RPT) * System alarm Line side ground fault (REF), negative-phase sequence protection (NS), contact overheat monitoring (OH) or tripping operation * Pretrip alarm 2 (PTA2), undervoltage alarm (UV) or spring charge operation *5 Main circuit input voltage 13, 23, 04, 14 R-phase - 13, S-phase - 23, T-phase - 04, N-phase - 14 Separate N-phase CT Polarity: 19 -, 29 - *3 Line side ground fault protection (REF) CT Polarity: 35 -, 36 - Zone interlock control power DC24V Zone interlock signal I/O 37, 38, 39, 40 See Fig. 17. Communication signal I/O Communication signal Common 32 (Reserved) 07-21

22 Fig Breaker circuits 2 Table 9-2 Terminal functions and circuit symbols 2 Symbol Meaning Symbol Meaning S 1 - S 4 Current sensors *6 LRC Latch release coil CT 1 - CT 3 Power supply CT *7 SHT Shunt trip device MHT Magnet hold trigger UVT Undervoltage trip device M Spring charging motor Main/control circuit contact Ry Control relay Hand connector SW1 Spring charged OFF switch User wiring SW2 Control relay a contact Relay or LED *1: For 4-pole ACBs. *2: For 4-pole ACBs equipped with N-phase protection and/or ground fault trip functions. *3: Used for 3-pole ACBs with ground fault trip functions to be installed in a 3-phase, 4-wire circuit. *4: Do not connect the ON switch with auxiliary switch b-contact in series. Doing so may cause pumping. *5: To be stated when ordering *6: Conversion ratio: CT rated primary current I CT (A)/150 mv *7: Provide power to the overcurrent trip device when control power is lost rd character: Type of contact 2nd character: Type of switch 1st character: Number of contact 1: Common, 2: b-contact, 4: a-contact 1: Auxiliary switch, 2: Position switch (CONN.), 3: Position switch (TEST), 4: Position switch (ISOLATED), 5: Position switch (INSERTED) 1-0:Number of auxiliary and position switch, A C: Number of auxiliary switch for microload Fig. 14 Terminal number and function of auxiliary and position switches 22

23 Fig. 15 provides the terminal arrangement of the ACB. Position switches (When 4C is used) Upper stage Middle stage Lower stage (When 2C is used) Upper stage Middle stage Lower stage Control/operation circuit Auxiliary switches (When standard 4C + optional 6C are used) (When standard 4C is used) (Com. terminals) The communication terminal block is added when the undervoltage trip device and the separate N-phase CT are used or the zone interlock, external indication or communication capability is provided. Fig. 15 Terminal arrangement Fig. 16 shows how to connect the line side ground fault protection (REF) CT when the overcurrent release (OCR) is provided with the REF capability. See Fig. 13 for other circuits than that of the line side ground fault protection CT. Fig. 16 Connection of the line side ground fault protection (REF) CT Fig. 17 shows how to connect ACBs when the overcurrent release (OCR) is provided with the zone interlock (Z) capability. See Fig. 13 for other circuits than that of the zone interlock. *1 Zone interlock requires control power (DC24V) between 33 and 34. *2 Zone interlock capabilities for shot time delay trip and for ground fault can be combined. *3 The zone interlock system allows selective discrimination that, when a fault current higher than the short time delay trip or ground fault trip pickup current is detected at a point in the power distribution system, operates the upstream ACB nearest to the point to shut off power within 50 ms even if the instantaneous trip function is set to NON, thus minimizing thermal and mechanical damage to the power distribution system. (The zone interlock system uses breaker 1, 2, n to shut off power when a fault current is detected in zone 1, 2, n within 50 ms.) *4 Up to eight ACBs can be connected in the zone interlock system. Connect the uppermost ACB as ACB 1 and the lowermost ACB as ACB n, assuming the number of ACBs is n. *5 The zone interlock cable should be of four-core, twisted pair shield type (Showa LW222S or equivalent). *6 Max. length pf cables 1 and 3 : 300 m 1 Zone interlock connection between ACBs for short time delay trip 2 Zone interlock connection of the lowermost ACB for short time delay trip 3 Zone interlock connection between ACBs for ground fault trip 4 Zone interlock connection of the lowermost ACB for ground fault trip Fig. 17 Zone interlock (Z) connections 23

24 Tables show the ratings of the operation power supply, the shunt trip device (SHT), the undervoltage trip device (UVT), auxiliary switches, position switches, operation indication contacts, and the N-phase CT. Table 10 Ratings of operation power supply Rated voltage (V) Permissible charging/closing voltage range Peak motor starting current (A) Ratings of operation power supply Steady-state motor current (A) Peak making current (A) Latch release coil (LRC) resistance (ohm) * AC AC AC AC AC AC DC DC DC DC DC DC DC * Ambient temperature: 20 C Table 11 Ratings of shunt trip device (SHT) Rated voltage (V) Permissible voltage range (V) Exciting current (max.) (A) Steady-state current (reference values) (A) Coil resistance (ohm) * AC AC AC AC AC AC DC DC DC DC DC DC DC * Ambient temperature: 20 C Max. contact parting time (ms) 40 Table 12 Ratings of undervoltage trip device (UVT) Rated voltage Opening voltage Attraction voltage Coil exciting Power consumption (VA) (V) range (V) (V) current (A) Normal Attraction AC AC AC AC AC AC AC AC AC DC DC DC * Ambient temperature: 20 C Coil resistance (ohm) * Holding coil: Attraction coil:

25 Table 13 Ratings of auxiliary and position switches Auxiliary switches *1 *2 For general feeder For microload *3 Voltage (V) Inductive load (A) Inductive load (A) Resistive load (A) Resistive load (A) *4 *5 Resistive load (A) Position switches Inductive load (A) *5 AC AC DC DC DC DC DC *1: Using b-contact results in contact chatter of 20 ms or less when the ACB opens or closes. *2: Do not apply different voltages to contacts of a switch. *3: Min. applicable load: DC5V/1 ma *4: AC cosθ 0.3, DC L/R 0.01 *5: AC cosθ 0.6, DC L/R Table 14 Ratings of operation indication contacts Rated contact current (A) Voltage (V) Individual indication Long-time delay trip, short-time delay trip, instantaneous trip, pretrip alarm, ground fault trip, system alarm Spring charging/tripping operation Resistive load (A) Inductive load (A) *1 Resistive load (A) Inductive load (A) *1 AC DC DC DC *1: AC cosθ 0.6, DC L/R Table 15 Ratings of N-phase CT Type of ACB Type of N-phase CT Ratings (A) AR650S, AR663S, AR663H EC160-40LS 5000/5A 6300/5A 25

26 4. OPERATION 4-1. Charging and Opening operation DANGER Never touch live terminal parts. Otherwise, electric shock may result. CAUTION Do not force down the charging handle after completion of manual charging operation. Doing so may cause a malfunction. The permissible operating voltage of the spring charging motor is 85 to 110% of the rated ac voltage or 75 to 110% of the rated dc voltage. Be sure to supply a voltage within the above ranges to the motor. Otherwise, burnout may result. Repeated open/close operation by the motor charging mechanism without pause should not exceed 15 times. If repeated continuous open/close operation is inevitable, a pause of at least 20 minutes should be provided after the repetitions of 15 times. Otherwise, a spring charging motor may be burnt out. Do not bring your hand or face close to arc gas vent of the arc chamber while the ACB is energized. Otherwise, a burn may result from high-temperature arc gas blowing out of the arc gas vent when the ACB trips open. If the ACB trips open automatically, remove the cause of tripping operation before re-closing the ACB. Otherwise, a fire could result. If the ACB has the breaker fixing bolts, make sure the bolts on both sides are securely tightened before using the ACB. Loosened fixing bolts may cause a malfunction of the ACB, in particular when it is installed in such an area that is subject to strong vibrations. The ACBs are available in two types in terms of the closing spring charging method and the remote operation capability: a manual charging type and a motor charging type. The manual charging type requires the charging and ON-OFF (close/open) operation to be done manually while the motor charging type allows the operation to be done either manually or by using a motor Charging operation The ACB can be closed only when the closing springs have been charged. Be sure to charge the closing springs before closing the ACB. The charging operation is permitted, regardless of whether the ACB is ON (closed) or OFF (open). The procedure for charging the closing springs is as follows: Manual charging Pump the charging handle (Fig ) until the charge indicator (Fig ) shows CHARGED Pumping the handle with the full stroke times will fully charge the closing springs. ON-OFF indicator 10 1 Charge indicator OFF button 6 Lock-in-OFF plate 7 ON-OFF button cover 8 9 ON button 8 ON-OFF button cover 2 Charging handle Position indicator 3 5 Draw-out handle insertion Fig. 18 Charging and opening operation 26

27 Motor charging When the charge indicator (Fig ) changes to DISCHARGED while the specified operation voltage is applied to the control circuit terminals 02 and 22, the charging motor is activated to start charging the closing springs. Upon completion of the charging operation, the charge indicator shows CHARGED and the charging motor is automatically deactivated. The time required for the motor charging operation depends on the operation voltage or the ACB types, but does not exceed 10 seconds Closing operation The ACB closing operation is not permitted unless all of the following conditions are met. 1) The charge indicator (Fig ) shows "CHARGED". 2) The position indicator (Fig ) shows "CONN.", "TEST" or "ISOLATED" (a halfway position not permitted). 3) The draw-out handle is not inserted in the draw-out handle insertion hole(fig ). 4) The OFF button (Fig ) is not locked with the lock-in-off plate (Fig ). 5) The specified voltage is supplied to the undervoltage trip device. The control power of the overcurrent release (OCR) must be supplied before closing operation in order that the internal program can be started. If the OCR trips open directly after the control power is supplied to the OCR, operation indication may be incorrect. Manual closing Open the ON-OFF button cover (Fig ) and press the ON button (Fig ). The ACB will be closed with a sound. The ON- OFF indicator (Fig ) shows "ON" and the charge indicator (Fig ) shows "DISCHARGED". Electrical closing Press the ON switch shown in Fig. 13. The latch release coil (LRC) (Fig. 13) will be excited and the ACB is closed with a sound. The ON-OFF indicator (Fig ) shows "ON", the charge indicator (Fig ) shows "DISCHARGED", and the charging motor starts charging the closing springs Opening operation Manual opening Open the ON-OFF button cover (Fig ) and press the OFF button (Fig ). The ACB will trip open with a sound. The ON- OFF indicator (Fig ) shows "OFF". Electrical opening Press the OFF switch shown in Fig. 13. The shunt trip device (SHT) or the fixed type undervoltage trip device (Fig. 13) will be excited so that the ACB trips open with a sound. The ON-OFF indicator (Fig ) shows "OFF" Motion of trip indication and spring charge indication switches The trip indication and spring charge indication switches provide the breaker status as shown in Table 16. Table 16 Motion of trip indication and spring charge indication switches Contact output State Type of OCR Operation Terminal No. See Fig. 13 Closing spring ACB open ACB closed Charged Discharged Not ready to close * Ready to close * All Trip 05, 17 No change No change OFF ON OFF Spring charge 05, 27 ON OFF No change No change No change * Ready to close means that all of the following conditions are met: 1. The closing springs are charged. 2. Opening operation is complete (At least 40 ms has elapsed after trip signal was produced). 3. The OFF button is released. 4. The specified voltage is applied to the undervoltage trip device (if equipped). 27

28 Motion of operation mechanisms Figs illustrate the motion of the charging and ON-OFF mechanisms. For manual closing operation, ON button 1 rotates counterclockwise. For electrical closing operation, push rod 1 ' protrudes downward from the latch release coil (LRC) and charge latch trigger 2 rotates clockwise. This rotates closing trigger shaft 3 clockwise and closing release lever 4 disengages from a semicircular pawl and rotates clockwise. And charging cam 5 rotates counterclockwise, so that charging lever 7 disengages from closing spring 6 and rotates counterclockwise. Closing cam 8 is pushed up by charging lever 7 and rotates clockwise. At this time, each component is positioned as shown in Fig. 21. Continued to Fig. 20. Fig. 19 Closing motion 1 (discharge motion) Closing cam 8 rotating clockwise causes closing link and top link 9 to be pushed straight. This rotates closing toggle cam 10 connected with closing link 9 counterclockwise, so that crossbar 11 rotates clockwise and thus moving contact 12 comes in contact with stationary contact 13. At this time, each component is positioned as shown in Fig. 22. Fig. 20 Closing motion 2 28

29 The charging handle or the charging motor provides a counterclockwise rotation to charging cam 1. This rotates closing release lever 2 and closing tripper lever 3 counterclockwise and a semicircular pawl engages with closing release lever 2. And charging lever 4 rotates clockwise so that closing spring 5 is compressed and closing cam 5 rotates counterclockwise. At this time, each component is positioned as shown in Fig. 19. Fig. 21 Charging motion For manual opening operation, OFF button 1 rotates counterclockwise and trip linkage 2 rotates clockwise. For electrical opening operation, push rod 1 protrudes downward from the shunt trip device (SHT) or the undervoltage trip device (UVT). For tripping operation by the overcurrent release (OCR), moving core 1 protrudes downward from the magnet hold trigger (MHT) and trip linkage 2 rotates counterclockwise. (Parts marked with an asterisk (*) are trip pins. To avoid superposition in the figure, magnet hold trigger related parts are drawn in positions that are different from actual positions. This rotates trip trigger shaft 3 counterclockwise and trip lever B 4 disengages from a semicircular pawl and rotates counterclockwise. And trip lever A 5 rotates counterclockwise, trip link 6 moves to a lower right direction and closing toggle cam 7 rotates clockwise. The force of closing spring 9 and contact spring 10 rotates crossbar 8 counterclockwise, so that moving contact 10 is parted from stationary contact 12. At this time, each component is positioned as shown in Fig. 20. Fig. 22 Opening motion 29

30 4-2. Draw-out and Insertion Operation General The draw-out type ACB consists of the breaker body and the draw-out cradle. The main and control circuit terminals are installed on the draw-out cradle, which permits you to draw out and inspect or service the breaker body without the need for removing wiring from the terminals. The draw-out mechanism allows you to move the breaker body to any of the four positions as shown in Fig. 23. The switchboard panel door can be shut with the breaker body drawn out to the CONN., TEST or ISOLATED position. 1. CONN. position 4. Removed position Position indicator Position indicator Control circuit contact Draw-out cradle Breaker body Main circuit contact Rollers Draw-out rail In this position, the main circuit and the control circuits of the ACB are connected to the external circuits for normal service. The breaker body is removed from the draw-out cradle. Draw-out Insert Insert Draw-out 2. TEST position 3. ISOLATED position Position indicator Position indicator Insert Drawout In this position, the main circuit is isolated, and the control circuits are connected. The ACB can be In this position, both the main and control circuits are isolated, and the ACB is completely de-energized. tested with the switchboard panel door closed. The switchboard panel door can be closed. Fig. 23 Positions of breaker body in draw-out cradle Operation Durability The AR series ACBs are designed to ensure the operation durability of 100 draw-out and insertion cycles in conformance to IEC and JIS C (one cycle means that the breaker body is drawn out from the CONN. position to the Removed position and inserted back to the CONN. position). Draw-out and insertion operation of more than 100 cycles could abrade the main circuit contacts, resulting in an overheat of the contacts during energization. 30

31 Draw-out operation DANGER Never touch live terminal parts. Otherwise, electric shock may result. Do not leave the ACB body in the removed position. The weight of the ACB may cause serious injury. CAUTION If the ACB has the breaker fixing bolts, be sure to loosen the bolts on both sides before draw-out operation. Otherwise, damage to the ACB may result. Make sure the draw-out cradle is secured with mounting screws before drawing out the breaker body. Otherwise, the draw-out operation may cause the breaker body or the draw-out cradle to fall, resulting in damage to the ACB or personal injury. When retracting the draw-out rail into the draw-out cradle, be sure to push the rail end. Do not hold the hook pin, body stopper, or body stopper shaft. Doing so may cause your fingers to be pinched, resulting in injury. Use the separate draw-out handle to draw-out the breaker body Moving the breaker body from the CONN. position to the TEST position 1) Open the ACB. (If the ACB remains closed, the draw-out handle (Fig ) cannot be inserted). 2) Loosen the breaker fixing bolts (Fig ), if used, to unlock the breaker body (Fig ). 3) Unlock the position lock lever (Fig ) if locked. See section ) Insert the draw-out handle into the draw-out handle insertion hole (Fig ) and slowly turn counterclockwise until the position indicator (Fig ) shows TEST. When the main circuit is disconnected at the disconnect contacts, the breaker body will be slightly pushed forward by the spring action of the main circuit disconnect contacts. At this moment, a bang sound will be heard. This sound does not mean a malfunction. The ACB cannot be closed as long as the draw-out handle is in the draw-out handle insertion hole. To close the ACB e.g., for ON-OFF testing, remove the draw-out handle. Hand connector 14 ON-OFF indicator 12 7 Draw-out cradle 3 Breaker body Draw-out handle insertion hole 4 Position lock lever Grip 2 Breaker fixing bolt 1 Draw-out handle Position indicator 5 Release button 6 Body stopper Body stopper shaft Hook pin 9 Draw-out rail Draw-out rail end 11 Draw-out direction 8 Rail stopper Fig. 24 Draw-out and insertion operation 31

32 Moving the breaker body from the TEST position to the ISOLATED position 1) Open the ACB. (If the ACB remains closed, the draw-out handle (Fig ) cannot be inserted). 2) Press the release button (Fig ). The release button will be locked depressed. 3) Unlock the position lock lever (Fig ) if locked. See section ) Insert the draw-out handle into the draw-out handle insertion hole (Fig ) and slowly turn counterclockwise until the position indicator (Fig ) shows ISOLATED and a freewheeling sound is heard. Turning the draw-out handle will unlock the release button. 5) Remove the draw-out handle Moving the breaker body from the ISOLATED position to the removed position 1) Make sure the draw-out cradle (Fig ) is secured with mounting screws. 2) Unlock the position lock lever (Fig ) if locked. See section ) Push the rail stoppers (Fig ) outward on both sides of the draw-out cradle to unlock the draw-out rail (Fig ), and then uphold and pull out the rail until it stops. The draw-out rail will be locked again by the stoppers. (The breaker body cannot be drawn out unless the rail is locked). 4) Holding both the grips (Fig ), draw out the breaker body until it stops. If the ACB is equipped with the communication terminal block, pull out the hand connector (Fig ) from the communication terminal block while drawing out the breaker body. Make sure the hand connector and control wire of the ACB are not snagged when drawing out the breaker body again. If the ACB is equipped with an optional auto-discharging device, the closing springs of the ACB will be automatically discharged with a mechanical sound. This sound does not mean a malfunction. Do not leave the ACB body on the draw-out rail pulled out. 5) Use an optional lifter or lifting plate to transfer the breaker body (Fig ) to a safe place. Refer to section Putting the breaker body back into the draw-out cradle DANGER Never touch live terminal parts. Otherwise, electric shock may result. Do not leave the ACB body in the removed position. The weight of the ACB may cause serious injury. CAUTION Make sure the draw-out cradle is secured with mounting screws before inserting the breaker body into the draw-out cradle. Otherwise, the insertion operation may cause the breaker body or the draw-out cradle to fall, resulting in damage to the ACB or personal injury. When retracting the draw-out rail into the draw-out cradle, be sure to push the rail end. Do not hold the hook pin, body stopper, or body stopper shaft. Doing so may cause your fingers to be pinched, resulting in injury. Do not forcedly turn the draw-out handle clockwise when the breaker body is in the CONN. Position. Doing so may cause a malfunction. If the ACB has the breaker fixing bolts, make sure the bolts on both sides are securely tightened before using the ACB. Loosened fixing bolts may cause a malfunction of the ACB, in particular when it is installed in such an area that is subject to strong vibrations. Use the separate draw-out handle to insert the breaker body Putting the breaker body back to the ISOLATED position 1) Make sure the draw-out cradle (Fig ) is secured with mounting screws. 2) Push the rail stoppers (Fig ) outward on both sides of the draw-out cradle to unlock the draw-out rail (Fig ), and then uphold and pull out the rail until it stops. The draw-out rail will be locked again by the stoppers. (The breaker body (Fig ) 32

33 cannot be inserted unless the rail is locked). 3) Use an optional lifter or lifting plate to place the breaker body rollers (Fig. 25) on the draw-out rail (Fig. 25). Do not leave the ACB body on the draw-out rail pulled out. 4) Make sure the breaker fixing bolts (Fig ), if fitted, are loosened and not arrest the breaker body. 5) Make sure the hand connector (Fig ) of the communication terminal block, if fitted, is so positioned that it does not get caught between the breaker body and the draw-out cradle. 6) If the ACB has the breaker fixing bolts (Fig ), make sure the bolts are loosened and, holding both the grips (Fig ), firmly push the breaker body into the draw-out cradle. If the ACB is equipped with the communication terminal block, plug the hand connector (Fig ) into the communication terminal block while pushing the breaker body. Into the draw-out cradle. Make sure the hand connector and control wire of the ACB are not snagged when pushing the breaker body into the draw-out cradle. 7) Push the rail stoppers (Fig ) outward on both sides of the draw-out cradle (Fig ) to unlock the draw-out rail, and then push the rail ends to insert the rail until it stops. The draw-out rail will be locked again by the stoppers. Breaker body Breaker body rollers Draw-out cradle Draw-out rail Fig. 25 Placing the breaker body on the draw-out rail Moving the breaker body from the ISOLATED position to the TEST position 1) Make sure the ON-OFF indicator (Fig ) shows OFF. (If the ACB remains closed, the draw-out handle (Fig ) cannot be inserted). 2) Unlock the position lock lever (Fig ) if locked. See section ) Insert the draw-out handle into the draw-out handle insertion hole (Fig ) and slowly turn clockwise until the position indicator (Fig ) shows TEST. The ACB cannot be closed as long as the draw-out handle is in the draw-out handle insertion hole. To close the ACB e.g., for ON-OFF testing, remove the draw-out handle Moving the breaker body from the TEST position to the CONN. position 1) Open the ACB. (If the ACB remains closed, the draw-out handle (Fig ) cannot be inserted). 2) Unlock the position lock lever (Fig ) if locked. See section ) Press the release button (Fig ). The release button will be locked depressed. 4) Insert the draw-out handle into the draw-out handle insertion hole (Fig ) and turn clockwise until the position indicator (Fig ) shows CONN. and the handle cannot be turned with its max. operating torque (14.7 N-m). 13 or 14 turns CONN. Position Turning the draw-out handle will unlock the release button. Fig. 26 Handle operating torque When the main contact starts engaging, the force required to turn the handle will increase as shown in Fig. 26. This symptom does not mean a malfunction. Continue to turn the handle. Rotating the handle more 13 or 14 turns moves the breaker body to the CONN. position, where the handle cannot be turned with its max. operating torque. 5) Remove the draw-out handle. 6) Tighten the breaker fixing bolts (Fig ), if used, to lock the breaker body. Operating torque TEST 33

34 Contact status of auxiliary and position switches Tables 17 and 18 show the contact status of auxiliary switches and position switches respectively. Table 17-1 Contact statues of auxiliary switches ACB state Breaker body position CONN. TEST ISOLATED Removed ON OFF Status of a-contact ON OFF ON OFF ON OFF ON OFF Status of b-contact OFF ON OFF ON OFF ON OFF ON Table 17-2 Contact statues of auxiliary switches (When pursuant to ship classification society rules) ACB state Status of Breaker ON OFF a-contact body position CONN. ON OFF TEST ON OFF ISOLATED ON OFF Removed ON OFF Status of b-contact OFF ON OFF ON OFF ON OFF ON Table 18 Contact statues of position switches Position indication Switch ISOLATED TEST CONN. CONN. position indication TEST position indication ISOLATED position indication Inserted position indication * * "Inserted" means that the breaker body is in the CONN., TEST, or ISOLATED position. Status of a-contact ON OFF ON OFF ON OFF ON OFF Status of b-contact OFF ON OFF ON OFF ON OFF ON 4-3. ON-OFF Button Cover Locking Procedure Lock the button cover using a padlock with ø6 shackle (up to 3 padlocks can be used) as shown in Fig. 27. The ON-OFF button cover is locked and the ON and OFF buttons cannot be operated. ON-OFF button cover OFF button ON-OFF button cover ON button Padlock ON-OFF button cover locking hole Fig. 27 Locking the ON-OFF button cover 34

35 4-4. Lock in OFF Procedure 1) Open the OFF button cover shown in Fig ) Raise the OFF-lock tab and close the button cover. 3) Lock the button cover using a padlock with ø6 shackle (up to 3 padlocks can be used) as shown in Fig. 30. The OFF button is locked depressed, which disables the ON button. OFF button OFF-lock tab Button cover locking hole OFF button cover Fig. 28 Locking the OFF button 4-5. Position Lock Lever Locking Procedure 1) Move the breaker body to the desired position (CONN, TEST or ISOLATED). 2) Pull out the position lock lever shown in Fig ) Lock the position padlock lever using a padlock with ø6 shackle (up to 3 padlocks can be used) as shown in Fig. 29. This prevents the draw-out handle from being inserted into the draw-out handle insertion hole, i.e., the breaker position cannot be changed. Position padlock hole Padlock Position padlock lever Fig. 29 Locking the position padlock lever 35

36 4-6. Breaker Fixing Bolt Securing Procedure 1) Move the breaker body to the CONN. position. 2) Tighten the breaker fixing bolt (Fig. 30) using the draw-out handle. This procedure is required for both the sides of the ACB. Breaker fixing bolt (red) Spring washer Flat washer Fig. 30 Securing the breaker fixing bolts Grip 4-7. OCR Cover Locking Procedure Lock the OCR cover using a padlock with ø6 shackle as shown in Fig. 31. The OCR cover cannot be opened, which prevents OCR settings from being changed. Padlock OCR cover OCR cover padlock hole Fig. 31 Padlocking the OCR cover 36

37 5. OVERCURRENT RELEASE (OCR) Options available for the type AR ACBs include a highly reliable, multi-functional overcurrent release (OCR) with a built-in 16-bit microprocessor. This OCR is supplied with power through a CT and main circuit current signals from current sensors. When the OCR detects a fault, it sends a trip signal to the magnet hold trigger (MHT) or provides a trip indication or an alarm depending on the type of the fault. The OCR uses the root mean square sensing for the long time delay (LT), pre-trip alarm (PTA, PTA2), and N-phase protection (NP) functions. If a harmonic current flows through the ACB continuously, the root mean square sensing allows the ACB to operate normally. The OCR is available in the type that follows: AGR-31BL L characteristic for general feeder (for works and transformer protection) AGR-31BR R characteristic for general feeder (3 characteristics conforming to IEC60255) AGR-31BS S characteristic for generator protection 5-1. Specifications Specifications of the OCR are shown in Table 19. Table 19 Specifications of type AGR-31B OCR ( : Standard, : Optional, : Not applicable) For generator Application For general feeder protection Reference Characteristic L R S section Type designation AGR-31BL-XX AGR-31BR-XX AGR-XXXX-XX Suffix (XX or XXXX) of type designation PS PG PS PG 31BS-PS 31BS-PR Long time delay trip (LT), short time delay trip (ST) and instantaneous trip 5-2., (INST/MCR) 1 Ground fault trip (GF) , Protective function Reverse power trip (RPT) N-phase protection (NP) , Negative-phase sequence protection (NS) 2 7 Line side ground fault protection (REF) , Contact overheat monitoring (OH) Zone interlock (Z) Pretrip alarm (PTA) Alarm function Pretrip alarm 2 (PTA2) , Undervoltage alarm (UV) COLD/HOT (LT) I 2 t ON/OFF (ST) 16 Protection INST/MCR (Instantaneous trip) , characteristic I 0.02 t/it/i 2 T/I 3 t/i 4 t (LT) 18 I 2 t ON/OFF (FG) , Polarity NOR/REV (RPT) Operation Indication on LCD and contact output (individual indication) indication Present current,/voltage/electrical energy/frequency (switchable between Measurement/ respective phase current and max. phase current) event Max. current/demanded power (max. phase current) indication Trip event log (last trip event) 9 20 Alarm event log (last alarm event) Communication Functions 3-3. External indicator Test function Control power supply 22 Required Required Required Required Required Required Two modes are available; one where the ACB is tripped open and operation indication is provided and the other where the ACB is not tripped and no operation indication is provided. Fail-safe against failure in setup (see 5-2). 2 Three modes are available; the first where the ACB is tripped open and operation indication is provided, the second where the ACB is not tripped and only operation indication is provided, and the third where the ACB is not tripped open and no operation indication is provided. 3 Residual current sensing. When a 3-pole ACB applies to a 3-phase, 4-wire circuit, be sure to use the separate N-phase protection CT (see 3-3). 4 Allows 3-phase generators operated in parallel to be protected against reverse power. 5 If the main circuit voltage exceeds AC250V, a step-down PT (potential transformer) is needed. 6 Provides protection to the neural conductor in a 3-phase, 4-wire circuit against overcurrent. This function applies to a 4-pole ACB. 7 Provides protection to ACBs against negative-phase current caused by phase loss or reverse phase, preventing damage to loads. 8 The line side ground fault protection capability allows the ACB to trip open when transformer windings or cables on the line side suffers a ground fault in TN-C or TN-S power distribution systems where the line side neutral is grounded. 9 Control power supply is required. Disabled when control power is lost. 10 Protects the breaker main contact against overheat, preventing troubles caused by thermal damage of the contact. Helpful for preventive maintenance. 11 Zone selective interlock implemented between ACBs in a hierarchical system allows the upstream ACB nearest a fault point to trip open in a minimum time, irrespective of short time delay trip or ground fault trip pickup timing, thereby minimizing thermal or mechanical damage to loads. This stands for selective discrimination with zero timing. 12 Two modes are available; one where operation indication is provided and the other where no operation indication is provided. 13 The pretrip alarm capability provides an alarm on the LCD and delivers contact output when it is detected that the current value exceeds the current setting for longer than the time setting, thereby preventing the ACB from tripping due to a gradual increase in load current. Pretrip alarm 2 allows two different timings to be set and helps regulate loads depending on their importance. 14 Provides an alarm on the LCD and delivers contact output when the voltage of the main circuit becomes low. 15 In HOT mode, the OCR is actuated in shorter time than in COLD mode when an overload occurs after a certain degree of load is maintained for a certain time of period. This mode helps protect heat sensitive loads. 16 I 2 t ON avoids intersection of characteristic curves of the ACB and e.g., a downstream fuse. This will improve selective discrimination flexibility. 17 INST is enabled, the OCR trips open the ACB when the trip pickup current is reached or exceeded, irrespective of the ACB status. When MCR is enabled, the OCR trips open the ACB when the ACB making current setting is reached or exceeded, and after tripping operation, it locks the ACB in the open state. MCR provides the INST function if the control power is lost. 18 Helpful for protection in coordination with fuses or the like. (IEC ) 19 Allows selection of the power supply terminal position between upstream and downstream of the breaker. 20 Logs the latest trip event and alarm event and allows displaying the cause, fault current value and operating time of the events. 21 Allows simplified field testing where simulation signals from/to the OCR are used to check for normal long time delay, short time delay, instantaneous and ground fault trip functions. 22 If the control power is lost, the long time delay trip, short time delay trip, instantaneous trip, ground fault trip, reverse power trip, N-phase protection and negative-phase sequence protection functions are alive. 37

38 5-2. Characteristics L characteristic for general feeder Characteristic settings and characteristic curves of the type AGR-11BL OCR (with L characteristic) are shown in Table 20 and Figs respectively. Table 20 Settings of type AGR-31BL OCR (with L characteristic) Setting item Symbol Setting range 1 CT rated primary current [I CT ] ( ) (A) Rated current 2 Long time delay trip (LT) In Applied [I CT ] (A) [I CT ] [I CT ] [I CT ] Rated current [I n ] (A) [I CT ] pickup current (continuous) IR [I n ] ( NON) (A) 4 Non tripping at not more than [I R ] 1.05, Tripping at more than [I R 1.05 and not more than [I R ] trip timing tr ( ) (sec) at 600% of [I R ], Tolerance: ±15%, +0.15s 0s COLD/HOT - COLD/HOT 6 pickup current Isd [I n ] ( NON) (A), Tolerance: ±15% 4 tsd Relaying time (ms.) Short time delay trip trip timing 8 Resettable time (ms.) (ST) 7 Max. total clearing time (ms.) I 2 t mode I 2 t tsd OFF/ON 9 Instantaneous trip pickup current Ii [I n ] ( NON) (A), Tolerance: ±20% 4 (INST/MCR) INST/MCR - INST/MCR pickup current 10 Ig [I CT ] ( NON) (A), Tolerance: ±20% 4 tg Relaying time (ms.) Ground fault trip trip timing Resettable time (ms.) (GF) Max. total clearing time (ms.) I 2 t mode I 2 t tg OFF/ON 9 Mode - TRIP/AL/OFF 11 N-phase protection trip (NP) 3 7 pickup current (continuous) IN [I CT ] ( ) Non tripping at not more than [I N ] 1.05, Tripping at more than [I N ] 1.05 and not more than [I N ] trip timing tr Depends on the long time delay trip pickup timing. Activated at 600% of [I N ]. COLD/HOT - Depends on the long time delay trip mode (COLD/HOT). 6 Current setting INS [I n ] ( ) (A), Tolerance: ±10% Time setting tns ( ) (sec) at 150% of [I NS ], Tolerance: ±20%, s 0 s Negative-phase sequence protection (NS) 12 Mode - TRIP/AL/OFF 11 Line side ground Current setting IREF [I CT ] ( NON) (A), Tolerance: ±20% 4 fault protection Time setting - Instantaneous (REF) Mode - TRIP/AL/OFF 11 Contact overheat Temperature setting 155 C monitoring Time setting Instantaneous (OH) Mode TRIP/AL/OFF 11 Zone interlock (Z) Current setting Interlock with short time delay trip pickup current 13 Time setting 50 ms. or less Current setting IP1 [I n ] ( ) (A), Tolerance: ±7.5% Pretrip alarm (PTA) Time setting tp1 ( ) (sec) at not less than [I P1 ], Tolerance: ±15%, +0.1s 0 s Mode - AL/OFF 14 Voltage setting [Vn] ( ) (V), Tolerance: ±5% Time setting ( ) (sec) at voltage setting or less, Tolerance: ±15%, +0.1s 0s Undervoltage alarm Recovery voltage setting [Vn] ( ) (V), Tolerance: ±5% 17 Mode AL/OFF 14 1 Underlined values are default settings. 2 A change in rated current setting results in changes in long time delay trip, short time delay trip, instantaneous strip, pretrip alarm and negative-phase sequence protection trip pickup current settings accordingly. 3 The operating time (t) at a long time delay (or N-phase protection) trip pickup current setting is given by t = tr loge {1 - (1.125IR/i ) 2 } ±15% [sec] (I R : Long time delay or N-phase protection trip pickup current setting, i: Overcurrent value, tr: Time setting) 4 NON setting disables protective functions. If the short time delay trip function and the instantaneous trip (or MCR) function are both attempted to be set to NON, however, the fail-safe operates so that: When the short time delay trip function has been set to NON, the instantaneous trip function cannot be set to NON or MCR. When the instantaneous trip function is set to NON or MCR, the short time delay trip function cannot be set to NON. 5 A pickup current means the threshold by which the OCR determines whether or not an overcurrent occurs. When the current flowing through the OCR exceeds the pickup current setting provided that [I R ] 1.05 < pickup current setting [I R 1.2, the OCR starts counting the time for tripping. Once the current flowing through the OCR reduces to less than the pickup current setting, time count is reset. 6 In HOT mode, the OCR is actuated in shorter time than in COLD mode when an overload occurs after a certain degree of load is maintained for a certain time of period. The OCR is factory se to COLD mode. See for how to set the OCR to HOT mode. If the control power is lost, load data stored in HOT mode is cleared. Fig. 32 shows the operating time in COLD and HOT modes. 7 The short time delay trip function has precedence over the long time delay trip function. The OCR operates at the short time delay trip timing even in those current ranges in which the long time delay trip time setting is shorter than the short time delay time setting. 8 If DC24V zone interlock power is not provided between 33 and 34, the zone interlock is inoperative and the short time delay trip function works with a total clearing time of 50 ms or less when a fault current is detected. 9 Fig. 33 shows the operating characteristic at I 2 t ON and I 2 toff. When I 2 t is ON, the OCR operates at fixed trip pickup current of 1000% of [In]. (100% of [ICT] for ground fault trip) 10 The ground fault trip pickup current setting should not exceed 1200A. 11 "TRIP" means the breaker is tripped open and operation indication is provided, "AL" means the breaker is not tripped and only operation indication is provided, and "OFF" means the breaker is not tripped open and no operation indication is provided. 12 The operating time (t) at a negative-phase sequence protection trip pickup current setting is given by t = 1.5 tns INS/i ±20% [sec] (I NS : Negative-phase sequence protection trip pickup current setting, i: Overcurrent value, tns: Time setting) (i is fixed to 3 I NS when i > 3 I NS ) 1 COLD mode 2 HOT mode where an overload occurs in a 50%- load state: Operating time: Approx. 80 % relative to COLD mode 3 HOT mode where an overload occurs in a 75%- load state: Operating time: Approx. 60% relative to COLD mode 4 HOT mode where an overload occurs in a 100%-load state: Operating time: Approx. 20% relative to COLD mode Fig. 32 COLD and HOT mode Fig. 33 I 2 t characteristic 13 Activated only when the fault point is within the zone covered by the breaker. 14 "AL" means operation indication is provided and "OFF" means no operation indication is provided. 15 Provides an alarm and delivers contact output when the voltage of the main circuit decreases to the voltage setting or lower for longer than the time setting. The alarm ceases when the main circuit voltage returns to the recovery voltage or higher. 16 When this capability is used in conjunction with the undervoltage trip device (UVT), an alarm may be provided after tripping operation of the breaker depending on the voltage setting. 17 The undervoltage alarm capability does not work if the main circuit voltage is originally under the recovery voltage.

39 Long time delay trip, Short time delay trip, Instantaneous trip N-phase protection trip and Pre-trip alarm Negative-phase sequence protection Ground fault trip Fig. 34 Characteristic curves of type AGR-31BL OCR (with L characteristic) 39

40 R characteristic for general feeder Characteristic settings and characteristic curves of the type AGR-31BR OCR (with R characteristic) are shown in Table 21 and Figs respectively. Table 21 Characteristic settings of type AGR-31BR OCR (with R characteristic) Setting item Symbol Setting range 1 CT rated primary current [I CT ] ( ) (A) Applied [I CT ] (A) Rated current 2 In Rated [ICT] current [ICT] [In] [ICT] (A) [ICT] Current setting Long time delay trip (continuous energization) IR [I n ] ( NON) (A), Tolerance: ±5% 4 (LT) 3 5 Time setting tr ( ) (sec) at 300% of [I R ], Tolerance: ±20%, s 0 s Protection type SIT: I 0.02 t, VIT: I t, EIT: I 2 t, 3IT: I 3 t, 4IT: I 4 t Current setting Isd [I n ] ( NON) (A), Tolerance: ±15% 4 tsd Relaying time (ms.) Short time delay trip Time setting 6 Resettable time (ms.) (ST) 5 Max. total clearing time (ms.) I 2 t protection type I 2 t tsd OFF/ON 7 Instantaneous trip Current setting Ii [I n ] ( NON) (A), Tolerance: ±20% 4 (INST/MCR) INST/MCR INST/MCR Current setting 8 Ig [I CT ] ( NON) (A), Tolerance: ±20% 4 tg Relaying time (ms.) Ground fault trip Time setting Resettable time (ms.) (GF) Max. total clearing time (ms.) I 2 t protection type I 2 t tg OFF/ON 7 Mode TRIP/AL/OFF 9 N-phase protection (NP) 3 5 Current setting (continuous energization) IN [I CT ] ( NON) (A), Tolerance: ±5% Time setting tr Depends on the long time delay trip pickup timing. Activated at 300% of [I N ]. Current setting INS [I n ] ( ) (A), Tolerance: ±10% Time setting tns ( ) (sec) at 150% of [I NS ], Tolerance: ±20%, s 0 s Negative-phase sequence protection (NS) 10 Mode TRIP/AL/OFF 9 Current setting IREF [I CT ] ( NON) (A), Tolerance: ±20% 4 Line side ground Line side ground fault fault protection protection bias current IREF2 [ICT] ( ) (A), Tolerance: ±20% (REF) Time setting Instantaneous Mode TRIP/AL/OFF 9 Contact overheat Temperature setting 155 C monitoring Time setting Instantaneous (OH) Mode TRIP/AL/OFF 9 Zone interlock (Z) Current setting Interlock with short time delay trip pickup current 11 Time setting 50 ms. or less Current setting IP1 [I n ] ( ) (A), Tolerance: ±7.5% Pretrip alarm (PTA) Time setting tp1 ( ) (sec) at not less than [I P1 ], Tolerance: ±15%, +0.1s 0 s Mode AL/OFF 12 Voltage setting [Vn] ( ) (V), Tolerance: ±5% Time setting ( ) (sec) at voltage setting or less, Tolerance: ±15%, +0.1s 0s Undervoltage alarm Recovery voltage setting [Vn] ( ) (V), Tolerance: ±5% 15 Mode AL/OFF 12 1 Underlined values are default settings. 2 A change in rated current setting results in changes in long time delay trip, short time delay trip, instantaneous strip, pretrip alarm and negative-phase sequence protection trip pickup current settings accordingly. 3 The operating time (t) at a long time delay (or N-phase protection) trip pickup current setting is given by t = tr/{ ( i/ir ) } ±20% [sec] (I 0.02 t protection type) t = 2 tr/{ ( i/ir ) 1 } ±20% [sec] (It protection type) t = 8 tr/{ ( i/ir ) 2 1 } ±20% [sec] (I 2 t protection type) t = 26 tr/{ ( i/ir ) 3 1 } ±20% [sec] (I 3 t protection type) t = 80 tr/{ ( i/ir ) 4 1 } ±20% [sec] (I 4 t protection type) (I R : Long time delay or N-phase protection trip pickup current setting, i: Overcurrent value, tr: Time setting) 4 NON setting disables protective functions. If the short time delay trip function and the instantaneous trip (or MCR) function are both attempted to be set to NON, however, the failsafe operates so that: When the short time delay trip function has been set to NON, the instantaneous trip function cannot be set to NON or MCR. When the instantaneous trip function has been set to NON or MCR, the short time delay trip function cannot be set to NON. 5 The short time delay trip function has precedence over the long time delay trip function. The OCR operates at the short time delay trip timing even in those current ranges in which the long time delay trip time setting is shorter than the short time delay time setting. 6 If DC24V zone interlock power is not provided between 33 and 34, the zone interlock is inoperative and the short time delay trip function works with a total clearing time of 50 ms or less when a fault current is detected. 7 Fig. 39 shows the operating characteristic at I 2 ON and I 2 OFF. When I 2 t is ON, the OCR operates at fixed trip pickup current of 1000% of [In]. (100% of [ICT] for ground fault trip) 8 The ground fault trip pickup current setting should not exceed 1200A. 9 "TRIP" means the breaker is tripped open and operation indication is provided, "AL" means the breaker is not tripped and only operation indication is provided, and "OFF" means the breaker is not tripped open and no operation indication is provided. 10 The operating time (t) at a negative-phase sequence protection trip pickup current setting is given by t = 1.5 tns INS/i ±20% [sec] (I NS : Negative-phase sequence protection trip pickup current setting, i: Overcurrent value, tns: Time setting) (i is fixed to 3 I NS when i > 3 I NS ) Fig. 35 I 2 t characteristic Activated only when the fault point is within the zone covered by the breaker. "AL" means operation indication is provided and "OFF" means no operation indication is provided. Provides an alarm and delivers contact output when the voltage of the main circuit decreases to the voltage setting or lower for longer than the time setting. The alarm ceases when the main circuit voltage returns to the recovery voltage or higher. When this capability is used in conjunction with the undervoltage trip device (UVT), an alarm may be provided after tripping operation of the breaker depending on the voltage setting. The undervoltage alarm capability does not work if the main circuit voltage is originally under the recovery voltage. 40

41 Long time delay trip, short time delay trip, instantaneous trip and pretrip alarm N-phase protection Fig. 36 Characteristic curves of type AGR-31BR OCR (with R characteristic of I 0.02 t protection type) Long time delay trip, short time delay trip, instantaneous trip and pretrip alarm N-phase protection Fig. 37 Characteristic curves of type AGR-31BR OCR (with R characteristic of It protection type) 41

42 Long time delay trip, short time delay trip, instantaneous trip and pretrip alarm N-phase protection Fig. 38 Characteristic curves of type AGR-31BR OCR (with R characteristic of I 2 t protection type) Long time delay trip, short time delay trip, instantaneous trip and pretrip alarm N-phase protection Fig. 39 Characteristic curves of type AGR-31BR OCR (with R characteristic of I 3 t protection type) 42

43 Long time delay trip, short time delay trip, instantaneous trip and pretrip alarm N-phase protection Fig. 40 Characteristic curves of type AGR-31BR OCR (with R characteristic of I 4 t protection type) Negative-phase sequence protection Ground fault trip Fig. 41 Characteristic curves of type AGR-31BR OCR (with R characteristic of common protection type) 43

44 S characteristic for generator protection Characteristic settings and characteristic curves of the type AGR-31BS OCR (with S characteristic) are shown in Table 22 and Figs. 42 and 43 respectively. Fig. 22 Characteristic settings of type AGR-31BS OCR (with S characteristic) Setting item Symbol Setting range 1 Rated current 2 In CT rated primary current [I CT ] (0.5 to 1.0) (A): Fixed to a single point Current setting Long time delay trip (LT) 3 [I n ] ( NON) (A), Tolerance: ±5% 4 (continuous energization) IR Time setting tr ( ) (sec) at 120% of [I R ], Tolerance: ±15%, s 0 s Current setting Isd [I n ] x ( NON) (A), Tolerance: ±10% 4 tsd Relaying time (ms.) Short time delay trip Time setting 6 Resettable time (ms.) (ST) 5 Max. total clearing time (ms.) I 2 t protection type I 2 t tsd OFF/ON 7 Instantaneous trip Current setting Ii [I n ] ( NON) (A), Tolerance: ±20% 4 (INST/MCR) INST/MCR INST/MCR Power setting PR [Pn] ( NON) (kw), Tolerance: +0% -20% 4 Reverse power trip Time setting ( ) (sec) at 100% of [PR], Tolerance: ±20% +0.15s 0 s (RPT) 8 Polarity NOR/REV 9 Mode TRIP/AL/OFF 10 Contact overheat Temperature setting 155 C monitoring Time setting Instantaneous (OH) Mode TRIP/AL/OFF 10 Zone interlock (Z) Current setting Interlock with short time delay trip pickup current 11 Time setting 50 ms. or less Current setting IP1 [In] ( ) (A), Tolerance: ±5% Pretrip alarm (PTA) Time setting tp1 ( ) (sec) at 120% of [I P1 ], Tolerance: ±15%, +0.1s 0 s Pretrip alarm (PTA2) Undervoltage alarm Mode AL/OFF 12 Current setting IP2 [I n ] ( ) (A), Tolerance: ±5% Time setting tp2 (1.5 tp1) (sec) at 120% of [I P2 ], Tolerance: ±15%, +0.1s 0 s Mode AL/OFF 12 Voltage setting [Vn] ( ) (V), Tolerance: ±5% Time setting ( ) (sec) at voltage setting or less, Tolerance: ±15%, +0.1s 0s Recovery voltage setting 15 [Vn] ( ) (V), Tolerance: ±5% Mode AL/OFF 12 Underlined values are default settings. Cannot be changed by the user. The operating time (t) at a long time delay trip (or pretrip alarm) pickup current setting is given by t = 1.44 tr ( IR/i ) 2 ±15% [sec] (I R : Long time delay trip or pretrip alarm pickup current setting, i: Overcurrent value, tr: Time setting) NON setting disables protective functions. If the short time delay trip function and the instantaneous trip (or MCR) function are both attempted to be set to NON, however, the fail-safe operates so that: When the short time delay trip function has been set to NON, the instantaneous trip function cannot be set to NON or MCR. When the instantaneous trip function has been set to NON or MCR, the short time delay trip function cannot be set to NON. The short time delay trip function has precedence over the long time delay trip function. The OCR operates at the short time delay trip timing even in those current ranges in which the long time delay trip time setting is shorter than the short time delay time setting. If DC24V zone interlock power is not provided between 33 and 34, the max. total clearing time is 50 msec, irrespective of the time setting. Fig. 42 shows the operating characteristic at I 2 t ON and I 2 t OFF. When I 2 t is ON, the OCR operates at fixed trip pickup current of 500% of [In]. The operating time (t) at a reverse power trip pickup current setting is given by Fig. 42 I 2 t characteristic t = trp/ { ( P/0.7PR ) -1 } ±20% [sec] (PR: Reverse power trip pickup current setting, P: Reverse power value, trp: Time setting) 9 Select NOR when the power supply of the load is upstream of the breaker and REV when it is downstream of the breaker. (See 5-3-4). 10 "TRIP" means the breaker is tripped open and operation indication is provided, "AL" means the breaker is not tripped and only operation indication is provided, and "OFF" means the breaker is not tripped open and no operation indication is provided. 11 Activated only when the fault point is within the zone covered by the breaker. If DC24V zone interlock power is not provided between 33 and 34, the zone interlock is inoperative and the short time delay trip function works with a total clearing time of 50 ms or less when a fault current is detected. 12 "AL" means operation indication is provided and "OFF" means no operation indication is provided. 13 Provides an alarm and delivers contact output when the voltage of the main circuit decreases to the voltage setting or lower for longer than the time setting. The alarm ceases when the main circuit voltage returns to the recovery voltage or higher. 14 When this capability is used in conjunction with the undervoltage trip device (UVT), an alarm may be provided after tripping operation of the breaker depending on the voltage setting. 15 The undervoltage alarm capability does not work if the main circuit voltage is originally under the recovery voltage. 44

45 Long time delay trip, short time delay trip, instantaneous trip and pretrip alarm Reverse power trip Fig. 43 Characteristic settings of type AGR-31BS OCR (with S characteristic) 45

46 5-3. How to Display Measurements and Make Settings CAUTION OCR setting changes must be performed by competent persons. After setting changes are made, the settings be checked with e.g., a type ANU-1 OCR checker (optional). After completion of OCR tests, be sure to return the settings to the original values. Failure to do so may cause a fire or burnout. Before changing OCR settings, open the ACB and then lock the OFF button to prevent the ACB from being closed inadvertently. Do not push the SET button diagonally. Doing so may cause a poor in return and malfunction. The following describes how to display measurements and make settings of the OCR General 1) Push the right end of the OCR cover to the left at the hollow on the front cover to unlatch and open the OCR cover. See Fig. 44. If the OCR cover is padlocked, first remove the padlock. OCR cover Hollow Front cover Fig. 44 OCR cover 2) Make sure that control power is supplied. Control power supply is required to display measurements. 3) The MENU, SET, cross and ENT buttons are used to navigate the LCD screen. Fig. 45 provides the general view of the OCR. 液晶画面の表示寿命は, 一般的にコントラストが 50% 以下になる時間で定められ, 週温 25, 湿度 55%RH の条件の下で, 約 5.7 年です 液晶画面が見にくくなった場合,OCR 全体の交換を要します OCR の交換については, 弊社にお問合わせ下さい LCD MENU button SET button Whole LCD screen Cross button ENT button CT rated primary current Rated current (factory set) Button symbols and their meanings : Press the SET button using a pointed tool such as the tip of a pen. : Press the MENU button. : Press the up key of the cross button. : Press the down key of the cross button. : Press the right key of the cross button. : Press the left key of the cross button. : Press the ENT button. The button symbols are used in Figs Fig. 45 OCR general view (type AGR-31BL) 4) Before changing OCR settings, open the ACB and then lock the OFF button to prevent the ACB from being closed inadvertently. Unlock the OFF button after changing OCR settings. 5) Close the OCR cover after viewing measurements or changing settings. 6) After setting changes are made, it is recommended that the settings be checked with e.g., a type ANU-1 OCR checker (optional). 46

47 Available screens The type AGR-31B OCR has seven screens available as shown in Fig. 46 below. Press the MENU button to go to the next screen. Monitor 1 screen (MONI): See This is the initial screen that appears when control power is turned on. Various current values can be viewed on this screen. Monitor 2 screen (MONI IVP): See Various current values, line voltage, phase voltage, power, demanded power, electrical energy, power factor and frequency can be viewed on this screen. Setup screen (SETUP): See This screen allows reviewing the rated voltage, CT rated primary current or other specifications and changing settings. Reset screen (RESET): See This screen allows clearing the measured max. current and the trip/alarm event log and resetting trip/alarm operation indication. Setting 1 screen (SET1): See This screen allows viewing settings relating to long time delay, short time delay, instantaneous and ground fault trip capabilities and changing these settings. Setting 2 screen (SET2): See This screen allows viewing settings relating to other capabilities than described above and changing these settings. Maintenance screen (MAINTE): See This screen allows viewing the trip/alarm event log. Test screen (MAINTE): See 5-4. This screen allows testing the long time delay, short time delay, instantaneous and ground fault trip functions. Fig. 46 Available screens 47

48 Monitor 1 screen Fig. 47 shows how to navigate the monitor 1 screen and Table 23 lists the items that can be viewed on this screen Fig. 47 Monitor 1 screen navigation Table 23 Monitor 1 subscreens No. Subscreen item *1 Description Tolerance 1 Max. phase current (present value) Initial display 2 Ground fault current (present value) Displayed only when THE ACB is equipped with the ground fault trip function 3 Max. phase current 4 Power (present value) - 5 (Monitor 2 screen) See *1: If no value is found for an item, the corresponding subscreen is skipped. ±1.5% of CT rated primary current [I CT ] Reading will be "0" when < 1.5% of CT rated primary current [I CT ]. 48

49 Monitor 2 screen Fig. 48 shows how to navigate the monitor 2 screen and Table 24 lists the items that can be viewed on this screen (from the next page) 15 (to the next page) Fig Monitor 2 screen navigation 49

50 12 (to the previous page) (from the previous page) (to the previous page) Fig Monitor 2 screen navigation Table 24 Monitor 2 subscreens No. Subscreen item *1 Description Tolerance 1 (Monitor 1 screen) See First phase (R/A-phase) current (present value) 3 Second phase (S/B-phase) current (present value) 4 Third phase (T/C-phase) current (present value) 5 Neutral (N-phase) current (present value) Displayed when the ACB is of 4-pole type 6 Ground fault current (present value) Displayed only when the ACB is equipped with the ground fault trip function 7 Negative-phase current (present value) Displayed only when the ACB is equipped with the negative-phase sequence protective function 8 Max. phase current Line voltage between first and second phases (R and 9 S-phases, A and B-phases) Displayed when the ACB is of single phase 3-wire Line voltage between second and third phases (S 10 or 3-phase 3/4-wire type capable of line voltage and T-phases, B and C-phases) indication Line voltage between thrid and first phases (T and R- phases, C and A-phases) 9 Phase voltage between first (R/A) and neutral (N) phases 10 Phase voltage between second (S/B) and neutral (N) Displayed when ACB is of 3-pahse 4-wire type phases capable of phase voltage indication 11 Phase voltage between third (T/C) and neutral (N) phases 12 Power 13 Demanded power 14 Max. demanded power 15 Electrical energy 16 Power factor 17 Frequency 18 (Setup screen) See *1: If no value is found for an item, the corresponding subscreen is skipped. ±1.5% of CT rated primary current [I CT ] Reading will be "0" when < 1.5% of CT rated primary current [I CT ]. 50

51 Setup screen Fig. 49 shows how to navigate the setup screen and Table 25 lists the items that can be viewed on this screen (from the next page) 16 (to the next page) Fig Setup screen navigation 51

52 13 (to the previous page) (from the previous page) Setting change mode Other settings can be changed in the same way on the respective subscreens. Cancel Save change : Flashing Fig Setup screen navigation 52

53 Table 25 Setup subscreens No. Subscreen item *1 Setting change Setting range/remarks *2 1 (Monitor 1 screen) See Main circuit rated voltage Disabled Fixed *3 3 CT rated primary current Disabled Fixed *3 4 Main circuit rated power Disabled Determined (calculated with main circuit rated voltage and rated current [In]) Fixed *3 (for OCR type AGR-31BS-PR) 5 Trip/alarm pickup settings Enabled % - AV (%: Percentage of setting reference, AV: Actual current (A/kA)/voltage (V)/power (W / kw) value) 6 Number of poles Disabled Fixed *3 7 PT (potential transformer) primary current Disabled Fixed (displayed only when THE ACB is equipped with the reverse power trip function and the main circuit voltage exceeds 250V) *3 8 PT (potential transformer) secondary Fixed (displayed only when THE ACB is equipped with the reverse power trip function and the main circuit Disabled current voltage exceeds 250V) *3 9 Phase wiring scheme Enabled 1φ3-3φ3-3φ4 10 Polarity Enabled NOR-REV (NOR: Normal connection, REV: Reverse connection) Select NOR when the power supply of the load is upstream of the breaker and REV when it is downstream of the breaker. (for OCR type AGR-31BS-PR) 11 Phase sequence Enabled (123 means RST (ABC) and 321 does TSR (CBA) from left to right, as seen from the front of the ACB) 12 Voltage indication Enabled L-N-L-L 13 Transmission address Enabled (31 addresses) *4 *5 14 Transmission rate Enabled 4800/9600/19200 baud 15 Parity Enabled EVE-ODD-NON 16 Demand interval Enabled (MIN) 17 Current adjustment, 1st phase Enabled (%) *6 *7 18 Current adjustment, 2nd phase Enabled (%) *6 *7 19 Current adjustment, 3rd phase Enabled (%) *6 *7 20 Current adjustment, Nth phase Enabled (%) (Equipped on 4-pole ACBs) *6 *7 21 Voltge ratio adjustment Enabled (%) *6 *7 22 Power adjustment Enabled (%) *6 *7 23 Setting change mode "Start" Press ENTER to enter this subscreen from a setup subscreen. The value that can be changed will flash. To exit this subscreen, press the right or left key of the cross button. 24 Setting change mode "Setting change" Press the up or down key of the cross button to change the setting. To exit this subscreen with no change in setting, press the right or left key of the cross button. 25 Setting change mode "Save change" Press ENTER to enter this subscreen from subscreen 19. "SURE" will be flashing. To save the change, press SET. The subscreen will exit to the Reset screen. To exit this subscreen while no change is saved, press the right or left key of the cross button. 26 (Reset screen) See *1: If no value is found for an item, the corresponding subscreen is skipped. *2: Underlined values are default settings. *3: Factory set according to your request. *4: The setting procedure is somewhat different from Press ENT while subscreen 13 is displayed. The ten's digit of the communication address will flash. Use the up or down key of the cross button to change the digit. After changing the ten's digit, press ENT again. The unit's digit of the communication address will flash. Use the up or down key of the cross button to change the digit. After changing the unit's digit, press ENT. "SURE" will start flashing. See the description of subscreen 25. If SET is pressed when the ten's digit is flashing, "SURE" will start flashing, indicating that the current subscreen has exited to subscreen 25. *5: If a communication address other than 01 to 31 is entered and SET is pressed, the address setting will not change; the ten's digit of the communication address will flash, then the OCR returns to setting change mode. *6: Factory set before delivery. *7: These subscreens are for making corrections to avoid variation in measurement. Settings on the subscreens have no influence upon trip/alarm pickup current values. 53

54 Reset screen Fig. 50 shows how to navigate the reset screen and Table 26 lists the items that can be cleared on this screen. When an item is cleared while its contact output is on, the contact output turns off Clear mode Other settings can be cleared in the same way on the respective subscreens. Cancel Clear : Flashing Fig. 50 Reset screen navigation Table 26 Reset subscreens No. Subscreen item Description 1 (Monitor screen) See Trip event log Allows clearing the trip event log (trip cause, fault current value and operating time). 3 Alarm event log Allows clearing the alarm event log (alarm cause, fault current value and operating time). 4 Max. demanded power Allows clearing the max. demanded power (see Fig ) 5 Max. phase current Allows clearing the max. phase current (see Fig ). 6 Integrated demand Allows clearing the integrated demand. 7 Clear mode "Start" Press ENTER to enter this subscreen from a reset subscreen. "NO" will flash. To exit this subscreen, press the right or left key of the cross button. 8 Clear mode "YES" Press the up or down key of the cross button. "YES" will appear. To exit this subscreen without clearing the item, press the right or left key of the cross button. 9 Clear mode "Clear" This subscreen appears when ENTER is pressed while "YES" is appearing. "SURE" will flash. To clear the item, press SET. The subscreen will exit to the Setting 1 screen. To exit this subscreen without clearing the item, press the right or left key of the cross button. 10 (Setting 1 screen) See

55 Setting 1 screen Fig. 51 shows how to navigate the Setting 1 screen and Table 27 lists the items that can be viewed or changed on this screen Cancel Save change Setting change mode Other settings can be changed in the same way on the respective subscreens : Flashing Fig. 51 Setting 1 screen navigation 55

56 Table 27 Setting 1 subscreens No. Subscreen item *1 Setting range/remarks *2 *3 1 (Monitor screen) See Rated current (L/R characteristic) [I CT ] ( ) (A) 2 Rated current (S characteristic) [I CT ] (0.5 to 1.0) (A): Fixed to a single point in increments of 1A *4 3 Long time delay trip characteristic (R characteristic) SIT-VIT-EIT-3IT-4IT (SIT: I 0.02 t, VIT: I t, EIT: I 2 t, 3IT: I 3 t, 4IT: I 4 t) *4 4 Long time delay trip pickup current L/R characteristic: [I n ] ( NON) (A) S characteristic: [I n ] ( NON) (A) 5 Long time delay trip pickup time L characteristic: (sec) R characteristic: (sec) S characteristic: (sec) 6 Long time delay trip mode HOT/COLD COLD/HOT 7 N-phase protection trip pickup current [I CT ] ( ) (A) 8 Short time delay trip pickup current L/R characteristic: [I n ] ( NON) (A) S characteristic: [I n ] ( NON) (A) 9 Short time delay trip pickup time L/R characteristic: (sec) S characteristic: (sec) 10 Short time delay trip I 2 t protection type OFF/ON 11 Instantaneous trip pickup current [I n ] ( NON) (A) 12 Instantaneous trip INST/MCR INST/MCR 13 Setting change mode "Start" Press ENTER to enter this subscreen from a setting 1 subscreen. The value that can be changed will flash. To exit this subscreen, press the right or left key of the cross button. 14 Setting change mode "Setting Press the up or down key of the cross button to change the setting. To exit this subscreen with no change in setting, press the change" right or left key of the cross button. 15 Setting change mode "Save change" Press ENTER to enter this subscreen while subscreen 14 is displayed. "SURE" will flash. To save the change, press SET. The subscreen will exit to the Setting 2 screen. To exit this subscreen while no change is saved, press the right or left key of the cross button. 16 (Setting 2 screen) See *1: If no value is found for an item, the corresponding subscreen is skipped. *2: Underlined values are default settings. *3: This table shows percent representations of settings. For AV representations (see 5-3-4), current values are indicated in A (Amperage). *4: Factory set according to your request. 56

57 Setting 2 screen Fig. 52 shows how to navigate the Setting 2 screen and Table 28 lists the items that can be viewed or changed on this screen (to the next page) (from the previous page) 17 (to the previous page) Fig Setting 2 screen navigation 57

58 14 (to the previous page) (from the previous page) (from the previous page) 2 (to the previous page) Cancel Save change Setting change mode Other settings can be changed in the same way on the respective subscreens : : Flashing Fig Setting 2 screen navigation 58

59 Table 28 Setting 2 subscreens No. Subscreen item *1 Setting range/remarks *2 *3 1 (Monitor screen) See Ground fault trip mode TRIP/AL/OFF 3 Ground fault trip pickup current [ICT] ( NON) (A) 4 Ground fault trip pickup time (sec) 5 Ground fault trip I 2 t protection type OFF/ON 6 Line side ground fault protection mode TRIP/AL/OFF 7 Line side ground fault protection trip pickup current [ICT] ( NON) (A) 8 Line side ground fault protection bias current [ICT] ( ) (A) *4 9 Line side ground fault protection bias limit 100% (fixed) *4 10 undervoltage alarm mode AL/OFF 11 Undervoltage alarm recovery voltage [Vn] ( ) (V) 12 Undervoltage alarm pickup voltage [Vn] ( ) (V) 13 Undervoltage alarm pickup time (sec) 14 Reverse power trip mode TRIP/AL/OFF 15 Reverse power trip pickup power [Pn] ( NON) (kw) 16 Reverse power trip pickup time (sec) 17 Negative-phase sequence protection mode TRIP/AL/OFF 18 Negative-phase sequence protection trip pickup current [In] ( ) (A) 19 Negative-phase sequence protection trip pickup time (sec) 20 Pretrip alarm mode AL/OFF 21 Pretrip alarm pickup current L/R characteristic: [In] ( ) (A) S characteristic: [In] ( ) (A) 22 Pretrip alarm pickup time L/R characteristic: ) (sec) S characteristic: (sec) 23 Pretrip alarm 2 mode AL/OFF 24 Pretrip alarm 2 pickup current [In] ( ) (A) 25 Pretrip alarm 2 pickup time 1.5 tp1 (sec) (determined by auto calculation) 26 Contact overheat monitor mode TRIP/AL/OFF 27 Contact overheat alarm pickup temperature 155 C (fixed) 28 Setting change mode "Start" Press ENTER to enter this subscreen from a setting 2 subscreen. The value that can be changed will flash. To exit this subscreen, press the right or left key of the cross button. 29 Setting change mode "Setting change" Press the up or down key of the cross button to change the setting. To exit this subscreen with no change in setting, press the right or left key of the cross button. 30 Setting change mode "Save change" Press ENTER to enter this subscreen from subscreen 29. "SURE" will flash. To save the change, press SET. The subscreen will exit to the Setting 2 screen. To exit this subscreen while no change is saved, press the right or left key of the cross button. 31 (Maintenance screen) See and 5-4. *1: If no value is found for an item, the corresponding subscreen is skipped. *2: Underlined values are default settings. *3: This table shows percent representations of settings. For AV representations (see 5-3-4), current values are indicated in A (Amperage), V (voltage),or kw (kilowatt). *4: The line side ground fault protection bias current and bias limit are coefficients for strain. Because the line side ground fault protection function performs an arithmetic operation using the difference between CTs with different characteristics, errors in measured line side ground fault current become significant when a large current flows through the ACB. "Strain" is to increase the line side ground fault trip pickup current with increasing current flowing through the ACB, thus preventing malfunctions caused by such an error. The following shows the relationship between the current flowing through the ACB and the line side ground fault protection trip pickup current under "strained" conditions: When ( i + irefct ) / 2 IREF2; IREFNOW = IREF When ( i + irefct ) / 2 > IREF2; IREFNOW = IREF [ 1 + a { ( i + irefct ) / 2 IREF2-1 } ] (IREF: Line side ground fault protection trip pickup current, IREF2: Line side ground fault protection bias current, a: Line side ground fault protection bias limit, i: Max. phase current (present value), irefct: Line side ground fault current, IREFNOW: Line side ground fault protection pickup current calculated using strain coefficients) Ex.: When ( i + iref ) / 2 = 5 IREF2 and other settings remain default; IREFNOW = IREF [ { 5 IREF2 / IREF2-1 } ] = IREF [ { 5-1 } ] = 5 IREF I REFNO α I REF /I REF2 (= 9 7 / 8 ) I REF ( 7 ) I REF2 ( 8 ) (I+I REFCT )/2 Fig. 53 Relationship between the current flowing through the ACB and the line side ground fault protection trip pickup current under "strained" conditions 59

60 Maintenance screen Fig. 54 shows how to navigate the maintenance screen and Table 29 lists the items that can be viewed on this screen Fig. 54 Maintenance screen Table 29 Maintenance subscreens No. Subscreen item *1 Description 1 (Monitor screen) See (Maintenance screen) 3 Trip event log (fault current value) Trip cause and fault current value 4 Trip event log (operating time) Trip cause and operating time 5 Alarm event log (fault current value) Alarm cause and fault current value 6 Alarm event log (operating time) Alarm cause and operating time 7 (Monitor screen) See *1: If no value is found for an item, the corresponding subscreen is skipped. 60

61 5-4. OCR Function Check CAUTION OCR function check and setting changes must be performed by competent persons. After completion of OCR tests, be sure to return the settings to the original values. Failure to do so may cause a fire or burnout. Use the following procedure to perform OCR function check. 1) Open the ACB and draw out the breaker body to the TEST position. 2) Change settings according to the test as shown in Table 30. Table 30 OCR setting changes Test *1 Output signal value Setting to be changed L characteristic: [IR] 6 Non Long time delay trip R characteristic: [IR] 3 Non S characteristic: [IR] 1.2 Non Short time delay trip [Isd] 1.2 [Ii] >[Isd] 1.5, Short time delay trip I 2 t protection: OFF Instantaneous trip Mode: INST [Ii] 1.2 MCR Mode: MCR Ground fault trip [Ig] 1.5 Ground fault trip I 2 t protection: OFF *1: Setting an item to NON and OFF disables the test for the item. 3) To check the ACB along with the OCR, close the ACB before applying a test signal. When checking the MCR function, close the ACB within 0.3 sec. after applying a test signal. 4) Follow the procedure described in Fig. 55 and Table 31 to check the OCR for normal operation. (In NTR mode, the ACB does not operate, a trip/alarm event is not saved in the log and operation indication contact output is not provided). 61

62 : Flashing 3 Fig. 55 OCR function check screen navigation Table 31 OCR function check subscreens No. Subscreen item *1 Description 1 (Monitor screen) See (Function check start subscreen) 3 Long time delay trip "LT" flashes. *2 *3 4 Short time delay trip "ST" flashes. 5 Instantaneous trip "INST" flashes. 6 Ground fault trip "GF" flashes. 7 OCR + ACB operation "TRIP" flashes. 8 OCR operation only "NTR" flashes. 9 Indication during testing *4 Pressing SET while subscreen 7 or 8 opens causes a test signal to be applied. 10 Trip event log (fault current value) The trip cause and fault current value are indicated. 11 Trip event log (operating time) The trip cause and operating time are indicated. *1: If no log is found, the corresponding subscreen is skipped. *2: When the long time delay trip function is selected, the short time delay trip and instantaneous trip functions are locked inoperative and cannot be used. The pretrip alarm function can be used. *3: Even when the HOT mode is selected, the test is carried out in COLD mode (Accumulated current value before testing is reset to zero before the test starts). *4: Only when the long time delay trip function is checked. The number of the signal source and "TRIP" are flashing. For other function checks, subscreen 7 or 8 will continue. 62

63 5-5. Operation Indication and Indication Resetting Procedure The OCR indicates a trip/alarm event on the LCD and provides contact output as shown in Table 32. Pressing the right or left key of the cross button changes the display from "trip/alarm cause" / "fault current/voltage/power" to "operating time" (if applicable). Pressing the MENU button returns the display to the previous screen. (Events saved in the event log can always be displayed on the maintenance screen. See 5.3.8). To reset contact output while retaining the event log, turn off the control power (Fig , 11, 21 ) at least 1 sec. To delete the event log and reset contact output on the LCD, follow the procedure shown in "Reset screen". Table 32-1 Operation indication 1 Operation Normal operation When picked up LCD State When activated (Use the right or left key of the cross button for screen navigation) After control power is off for at least 1 sec. Terminal No. See Fig. 13 Contact output State Normal operation When activated After control power is off for at least 1 sec. Control power supply Long time delay trip (LT) N-phase protection (NP) ON 2 Short time delay trip (ST) ON 2 Instantaneous trip (INST/MCR) Normal indication - Normal indication 1 OFF OFF Required 3 Ground fault trip (GF) ON Reverse power trip (RPT) ON 2 Negative-phase sequence protection (NS) ON The ACB can be opened, closed or tripped, irrespective of whether or not the operation indication is reset. The operation indication is updated when a protective function is activated. means flashing. 1 The event log is not cleared. 2 For S characteristic, the delay is as short as 500 ms or more. 3 " (ka)" is indicated when the short time delay or instantaneous trip function is activated and [ICT] 17 is exceeded. 63

64 Table 32-2 Operation indication Operation Normal operation When picked up LCD State When activated After control power is off for at least 1 sec. Terminal No. See Fig. 13 Contact output State Normal operation When activated After control power is off for at least 1 sec. Control power supply Line side ground fault protection (REF) ON OFF Normal indication 1 Contact overheat monitoring (OH) ON OFF Pretrip alarm (PTA) Normal indication ON 2 OFF Normal indication OFF Required Pretrip alarm 2 (PTA2) Normal indication ON 2 OFF Undervoltage alarm (UV) Normal indication ON 2 OFF System alarm Normal indication ON 3 OFF 4 The ACB can be opened, closed or tripped, irrespective of whether or not the operation indication is reset. The operation indication is updated when a protective function is activated. means flashing 1 The event log is not cleared. 2 The alarm is self-recovered when the fault current decreases to less than the setting. 3 "SYS1" means disconnection of the magnet hold trigger (MHT) and "SYS2" does a tripping failure (incorrect operating time, mechanical malfunction etc). 4 The OCR has a self-monitoring feature that monitors the OCR internal circuit, the magnet hold tripper (MHT) circuit, and the ACB state. An alarm caused by transient noise can be cleared or deleted. If such an alarm cannot be cleared, check the ACB. See chapter 7. 64

65 6. MAINTENANCE, INSPECTION AND PARTS REPLACEMENT This chapter describes the maintenance and inspection procedure for the AR series ACBs. The service life of the ACB depends on the working and environmental conditions. The ACB is exposed to mechanical and electrical stresses and thus suffers gradual degradation during use, which will increase the possibility of malfunctions. Preventive maintenance and periodical inspection are very important to avoid any functional degradation, prevent malfunctions, extend the service life, and ensure safe operation. The appropriate frequency of maintenance and inspection of the ACB varies depending on the installation conditions, the number of tripping operations, the magnitude of breaking current, and other factors that are to be considered empirically. As a guideline, Table 33 shows the recommended inspection frequency. See section 6-1 for detailed maintenance and inspection procedures. Table 33 Frequency of maintenance and inspection Working and environmental Inspection Frequency in interval or number of open/close cycles Category conditions level Interval Number of open/close cycles Every year or 2 years Open/close 1250AF - 800AF or less condition 2500AF Every year after 3 years Normal/ Nearly no current since installation Every 1000 cycles Detailed level Every half year after 6 Rated current Every 1000 Every 500 years since installation level cycles cycles Normal Not so dusty, Not so much corrosive gases, Ambient temperature: 35 C or lower Not so humid, Number of open/close cycles per day: 2 or less Ex. Switchboards in electric installation rooms, Control rooms, Thorough Every 5 or 6 years Every 4 years after 6 years since installation Every year or 2 years after 10 years since installation Every 4000 cycles Building installation Overhaul When abnormality is found during normal or through inspection 3200AF or more Every 100 cycles Open/close 1250AF AF or Highly dusty, 800AF or less condition 2500AF more Much corrosive gases, Nearly no current Every 1000 cycles Ambient temperature: 45 C Every year level Every 500 cycles after 1000 cycles Normal/ or higher, Every half year after 2 Every 1000 Every 500 Every 100 Detailed years since installation cycles cycles cycles Highly humid, Rated current Every 500 Every 250 Every 50 Number of open/close cycles level cycles after cycles after cycles after Harsh per day: 4 or more, 1000 cycles 500 cycles 100 cycles Always exposed to vibrations Every 2 or 3 years Ex. Iron or chemical plants Every 2 years after 6 years Engine rooms (without Every cycles Thorough since installation ventilation), Every 2000 cycles after 3000 cycles Every year after 10 years Cogeneration installation, Ferryboats Overhaul since installation When abnormality is found during normal or through inspection Open/close 1250AF AF or 800AF or less condition 2500AF more Abnormal Open/close operation due to Overcurrent level Every 25 Every 25 Every 25 overload, Thorough When abnormality occurs (approx. 6 times cycles cycles cycles the rated current) Tripping due to shortcircuit, Level exceeding Accidentally submerged Every time Every time Every time overcurrent level Overhaul When ACB is deemed to be repairable at through inspection Normal inspection includes inspection and actions that can be done only with removing the arc chamber, contacts, front cover and the like. Normal inspection can be performed by the user. Terasaki also provides normal inspection service. Detailed inspection includes inspection, actions, and parts replacement that will be done to prevent functional degradation caused by aging or the like when abnormality is found during normal inspection. You are recommended to use Terasaki s detailed inspection service. Thorough inspection must be left to Terasaki. Overhaul will be done in a Terasaki s factory. About the service life The expected service life of AR series ACBs is shown in the "Endurance in number of ON-OFF cycles" rows in Tables 3 and 4. "With maintenance" in the tables means that appropriate inspection, maintenance, repair, and parts replacement are performed according to the instructions in this chapter. But, when an ACB performs three times of tripping operation nearly at the rated breaking current (three standard operating duty cycles), it is at the end of its safe service life even if thorough inspection is done every time it trips open. Such an ACB will be apt to suffer malfunctions and should be replaced without delay to avoid frequent inspection and parts replacement. See section 6-2 for detailed parts replacement procedures. 65

66 6-1. Inspection Procedures CAUTION ACB maintenance, inspection and parts replacement must be performed by competent persons. Do not touch ACB current carrying parts and ACB structural parts close to a current carrying part immediately after the ACB trips open. Remaining heat may cause a burn. Prior to commencing any work on the ACB, open an upstream circuit breaker or the like to isolate all sources of power/voltage from the main and control circuits. Otherwise, electric shock may result. Take care to avoid adhesion of dust to main and control circuit contacts. Dust on the contacts may result in a fire. Prior to commencing maintenance, inspection, or parts replacement, make sure that the closing springs are released and the ACB is open. Otherwise, unintentional open/close operation may lead to fingers or tools to be pinched by the open/close mechanism, resulting in injury. Retighten the terminal screws periodically to the specified torque. Otherwise, a fire could result. When grinding a contact tip, be careful to prevent grinding dust from entering the breaker operating mechanism. Wipe the tip clean after grinding. Otherwise, a malfunction or fire could result. Do not perform dielectric withstand/insulation resistance tests under other conditions than specified. Doing so may cause a malfunction. Be sure to reinstall the arc chamber if removed. Failure to do so or incorrect installation of the arc chamber may result in a fire or burn. When charging the closing springs or performing open/close operation of the ACB with the arc chamber, front cover and/or side covers removed during maintenance or inspection work, do not touch parts other than those required for the above operation (charging handle, ON/OFF buttons, moving core and the like). Doing so may cause fingers or tools to be pinched, resulting in injury. When replacing an auxiliary, do not damage the control wire for the auxiliary or pinch the wire between the auxiliary and the breaker body. Doing so may cause a malfunction. To ensure safety, be sure to perform the preparation work described in section unless otherwise specified in the inspection procedures. The normal inspection procedure and the detailed inspection procedure are shown in Tables 35 and 36 respectively. Information you are requested to state If you want us to take action against an abnormality, contact us while providing us the information shown in Table 34 below. Our contact is shown at the end of this manual. Table 34 Information you are requested to state Item Description Reference Type AR poles with draw-out cradle Serial No. Rating nameplate Main circuit rated current AC DC V Product Specifications Rated voltage A I n Spring charging method Manual charging Motor charging CLOSING section on Rated operation voltage: AC DC V specification nameplate Overcurrent release Non Equipped Type: AGR-2 OCR section on Rated control voltage: AC DC V specification nameplate Electrical tripping device Shunt trip device (SHT) Rated voltage: AC DC V TRIPPING section on Undervoltage trip device (UVT) Rated voltage: AC DC V specification nameplate Special specification SR: SS: SO: OTHERS section on specification nameplate Working conditions (Voltage, current, environment) - Symptom of abnormality (in detail): When, How, Where, etc.) - Inspection done/actions taken (if any) 6-1. Status quo and schedule Permissible power cut date and time: Place where you want us to take action: - The contents of the nameplate should be provided in detail. Related documents such as product specifications and inspection reports should be provided. If you have a desired inspection and maintenance schedule, let us know the schedule at your earliest convenience. Our service representative could not meet your last minute requirement. 66

67 Table 35 Normal inspection procedure Check point No. Check item Description 1 Discoloration Check connection conductors, main circuit terminals, and current carrying parts for heat of conductors discoloration. If such a symptom is found, contact us. Check that screws, bolts, nuts, washers, springs, retainers and the like are not missing. If any parts 2 Parts missing are missing, contact us. General (*1) Main/control circuit terminals See 2-3. Main/control circuit contacts See 4-2. Arc chamber See Main circuit, Arc chamber See Contacts See 6-2-2, Control circuit See Operating mechanism See Auxiliary switches See Operation related mechanism See 4-1 and 4-2. Damage to 3 parts 4 Dust accumulation 5 Connections 6 Surface condition 7 10 Dust accumulation /Damage 8 Insulation resistance 9 Surface condition Looseness of screws 11 Wiring 12 Internal mechanism 13 Operation 14 Auxiliary contacts Looseness of 15 screws Drawout/insertion 16 mechanism 17 UVT 18 Operation mechanism, LRC, SHT and UVT Check for deformation, cracks, chips, rust, or other damage of parts. If damage is found, contact us. Check that no dust is accumulated in ACB. If dust is accumulated, use vacuum cleaner to remove dust and wipe off with dry, clean cloth. Check main circuit terminal screws, ground terminal screw, auxiliary switch terminal screws, control circuit terminal screws, and position switch terminal screws for looseness. If loose, tighten to specified torque. Draw out the breaker body from draw-out cradle and check that contacts have no dust accumulation and discoloration. If dust is accumulated, use vacuum cleaner to remove dust and wipe off with dry, clean cloth. If surface is discolored badly, polish it with #200 sandpaper. (*2) For main circuit contacts, apply contact grease (SS grease, No. F-5G, FUJI KAGAKU SANGYO) to contact surface after cleaning. Excessive grease may foster dust accumulation. Grease should be applied lightly. Blackening of contacts is caused by oxidation or sulfuration and has no harmful effect except in extreme cases. If heat discoloration, arc marks, roughness, or peeling of plating layer is found, contact us. Remove arc chamber and check it for foreign object or dust accumulation, deformation, cracks, chips and other damage. If foreign matter or dust is accumulated, use vacuum cleaner to remove foreign matter of dust and wipe off with dry, clean cloth. If metal spatters are adhered, use sandpaper to remove them. (*2) If arc chamber has stubborn adherents suffers damage, replace arc chamber. Close ACB and, using DC500V Megger, check that insulation resistance between main circuit terminals, between main circuit terminal group and ground, and between ends of adjacent grids exceeds 5M ohm. If resistance does not exceed 5M ohm, use sandpaper to remove carbonized portions of insulation around contacts or current carrying parts and/or spatters adhered to arc chambers and arc extinguishing grids. (*2) If problem persists, contact us. Remove arc chamber and check contact circumference, contacts, and contact tips for foreign object or dust accumulation, deformation, cracks, chips and other damage. If dust is accumulated, use vacuum cleaner to remove dust and wipe off with dry, clean cloth. If contact tips are badly discolored or roughened, polish with #200 sandpaper. (*2) If contact tip suffers damage or is less than 0.7 mm thick after polishing, replace both moving and stationary contacts. Blackening of contact tips is caused by oxidation or sulfuration and will be removed during closing operation. It has no harmful effect except in extreme causes. If heat discoloration is found, perform detailed inspection. Check moving and stationary arc contact mounting screws for looseness. If loose, retighten. Remove side and front covers, check that wiring is properly connected, and not disconnected nor damaged. If incorrect connection is found, connect correctly. If disconnection or damage is found, contact us. With OCR removed, check internal mechanism for missing parts, deformation, cracks, chips, foreign mater or dust accumulation, breakage of springs, and rust. If foreign matter or dust is accumulated, use vacuum cleaner to remove foreign matter of dust and wipe off with dry, clean cloth. If any parts are missing or damaged or springs are broken, contact us. State of Current conducting Current conducting Check that auxiliary switches operation lever between _11 and _12 between _11 and _14 operate as shown to the right. Natural position 100 mω or less Non If not so, replace switches. Uppermost lift Non 100 mω or less position Remove auxiliary switches and check contacts for roughness. If roughened excessively, replace contacts. Check screws of auxiliary switches for looseness. If loose, retighten. Draw out and insert breaker body to check that draw-out handle can be turned with max. operating torque or less, position indictor provides correct indication, release button operates normally, and no abnormal sound is heard during handle operation. If abnormality is found, contact us. With breaker body in ISOLATED position, charge closing springs manually and attempt closing ACB to make sure ACB cannot be closed. If ACB can be closed, perform detailed inspection. *1: Always check the "General" items during the inspection procedure shown in Table 24 above. *2: Take care to avoid grinding dust from entering the ACB. Wipe contact surfaces clean of grinding dust. With breaker body in TEST position and operation mechanism, SHT and UVT supplied with power, perform closing spring charging operation and manual and electrical open/close operation several times to check that charge indicator, ON-OFF indicator and ON-OFF cycle counter provide correction indication and no abnormal sound is heard. If abnormality is found, perform detailed inspection. 67

68 Table 36 Detailed inspection procedure Check point No. Check item Description 1 Coil resistance Disconnect hand connector (red) and, using tester, measure coil resistance between terminals and make sure holding coil is rated at Ω and attraction coil at Ω. (*) If not so, replace UVT. 2 Operation Remove UVT and press in plunger, and make sure releasing plunger causes plunger to be smoothly restored. If not so, replace UVT. Undervoltage trip device (UVT) See Contacts See 6-2-2, Latch release coil (LRC) See Shunt trip device (SHT) See Magnet hold trigger (MHT) See Charging motor and LRC SHT UVT OCR and MHT Length and 3 stroke of plunger 4 Hand connector Looseness of 5 screws 6 Parting distance 7 Coil resistance Length and 8 stroke of plunger 9 Hand connector Looseness of 10 screws 11 Mechanical motion 12 Coil resistance Length and 13 stroke of plunger 14 Hand connector Looseness of 15 screws 16 Mechanical motion 17 Coil resistance 18 Operation Length and 19 stroke of moving core 20 Hand connector Looseness of 21 screws 22 Electrical operation 23 Electrical operation 24 Electrical operation 25 Operation Remove UVT and, using vernier caliper, make sure plunger length is mm in natural state and plunger stroke is mm. If not so, replace UVT. Check that hand connector (red) is connected to ACB hand connector (red) correctly. If incorrect, connect correctly. Check UVT mounting screws for looseness. If loose, retighten. With ACB open, remove arc chamber and, using compass and vernier caliper, make sure distance between moving and stationary arc contact tips falls within the following ranges. If not so, replace both moving and stationary contacts. If it is useless to replace contacts, contact us. Parting phase A-C distance phase N (mm) Disconnect hand connector (green) that is closer to coil than the other and, using tester, measure coil resistance between terminals and make sure it is within range specified in Table 10. (*) If not so, replace LRC. Remove LRC and, using vernier caliper, make sure plunger length is mm in natural state and protrusion of plunger is mm when moving core is pushed in. If not so, replace LRC. Check that hand connector (green) is connected to ACB hand connector (green) correctly. If incorrect, connect correctly. Check LRC mounting screws for looseness. If loose, retighten. With closing springs charged, check that pushing moving core results in ACB being closed slowly, and releasing moving core results in the core being restored smoothly. If not so, replace LRC. If it is useless to replace LRC, contact us. After inspection, open ACB and discharge closing springs. Disconnect hand connector (black) that is closer to coil than the other and, using tester, measure coil resistance between terminals and make sure it is within range specified in Table 11. (*) If not so, replace SHT. Remove SHT and, using vernier caliper, make sure plunger length is mm in natural state and protrusion of plunger is mm when moving core is pushed in. If not so, replace SHT. Check that hand connector (black) is connected to ACB hand connector (black) correctly. If incorrect, connect correctly. Check SHT mounting screws for looseness. If loose, retighten. With ACB closed, check that pushing moving core results in ACB being opened slowly, and releasing moving core results in the core being restored smoothly. If not so, replace SHT. If it is useless to replace SHT, contact us. After inspection, discharge closing springs. Disconnect hand connector (red) and, using tester, measure coil resistance between terminals and make sure it is Ω. (*) If not so, replace MHT. Remove MHT and pull out moving core slowly, and make sure pushing moving core allows core to be smoothly retracted and attracted If not so, replace MHT. Remove MHT and, using vernier caliper, make sure protrusion of moving core is mm in pulled-out state. If not so, replace MHT. Check that hand connector (red) is connected to ACB hand connector (red) correctly. If incorrect, connect correctly. Check MHT mounting screws for looseness. If loose, retighten. With breaker body assembled to original state, move breaker body to TEST position, supply ACB with operation power, and attempt to perform motor charging and electrical closing operation with max. and min. voltages within permissible charging/closing voltage range to make sure ACB operates normally. (See Table 10). If ACB does not operate normally, contact us. With breaker body assembled to original state, move breaker body to TEST position, close ACB, supply SHT with power, and attempt to perform electrical opening operation with max. and min. voltages within permissible closing voltage range to make sure ACB trips open normally. (See Table 11). If ACB does not trip open, contact us. With breaker body assembled to original state, move breaker body to TEST position, charge closing springs, and make sure that ACB closes when UVT is supplied with attraction power. And decrease UVT supply voltage to make sure ACB opening voltage is within specified opening voltage range. (See Table 12.) If ACB does not operate normally, contact us. With breaker body assembled to original state, check OCR and MHT with type ANU-1 OCR checker (optional) to make sure ACB operates normally. If ACB does not operate normally, contact us. Always check the "General" items in Table 24 during the inspection procedure shown in Table 25 above. * Take care to avoid damaging or deforming terminal pins when bringing tester lead into contact with them. 68

69 6-2. Parts Replacement Procedure CAUTION ACB maintenance, inspection and parts replacement must be performed by competent persons. Do not touch ACB current carrying parts and ACB structural parts close to a current carrying part immediately after the ACB trips open. Remaining heat may cause a burn. Prior to commencing any work on the ACB, open an upstream circuit breaker or the like to isolate all sources of power/voltage from the main and control circuits. Otherwise, electric shock may result. Take care to avoid adhesion of dust to main and control circuit contacts. Dust on the contacts may result in a fire. Prior to commencing maintenance, inspection, or parts replacement, make sure that the closing springs are released and the ACB is open. Otherwise, unintentional open/close operation may lead to fingers or tools to be pinched by the open/close mechanism, resulting in injury. Be sure to reinstall the arc chamber if removed. Failure to do so or incorrect installation of the arc chamber may result in a fire or burn. When replacing an auxiliary, do not damage the control wire for the auxiliary or pinch the wire between the auxiliary and the breaker body. Doing so may cause a malfunction Preparation Be sure to make the following preparations for parts replacement in order to ensure safety. 1) Open an upstream circuit breaker or the like to isolate all sources of power/voltage from the main and control circuits. 2) Draw out the breaker body to the removed position, and remove it using an optional lifter or lifting plate. Refer to sections and ) Discharge the closing springs and open the ACB. The procedure varies depending on whether or not the ACB is equipped with the undervoltage trip device (UVT). When the ACB is not equipped with the undervoltage trip device (UVT): Perform manual closing/opening operation of the ACB. Refer to sections and When the ACB is equipped with the undervoltage trip device (UVT): (1) First remove the side covers and then loosen the front cover mounting screws. Turn the front cover mounting screws five or six turns to loosen as shown in Fig. 56. (Front cover mounting screws are of captive type and cannot be removed from the front covers.) Location of cover mounting screws Front cover Front cover Side covers Cover mounting screws Side cover mounting screw (captive) Pan head M5 x 8 (8) with spring and flat washers Tightening torque: N m Cover mounting screw (captive) Pan head M5 x 20 (4) with spring and flat washers Tightening torque: N m Side cover Side cover Fig. 56 Cover mounting screws 69

70 (2) Remove the contact block fixing screws as shown in Fig. 57. Contact block Contact block fixing screw Pan head M5 x 10 (2) with spring and flat washers Tightening torque: N m Fig. 57 Contact block fixing screws (3) Slide the front cover to the left and flip the contact block up as shown in Fig. 58. Front cover Contact block Fig. 58 Flipping the contact block (4) Turn the UVT mounting screws eight or ten turns to loosen, disconnect the manual connector (red), and then remove the UVT as shown in Fig. 59. Hand connector UVT mounting screw Pan head M4 x 60 (2) with spring washer Tightening torque: N m UVT LRC Fig. 59 Removing the UVT 70

71 (5) Flip the contact block down and slide the front cover to the original position as shown in Fig. 60. Front cover Contact block Fig. 60 Sliding the front cover to the original position (6) Perform manual closing/opening operation of the ACB. Refer to sections and (7) Reinstall each part or component in reverse order of removal after inspection. When installing the UVT, make sure the nameplate on the UVT can be viewed from the front of the ACB. Fig. 61 provides the general view of the UVT. UVT mounting screw Plunger Terminal No.1 Terminal No.2 Terminal No.3 Hand connector (red, 3 Terminals) Attraction coil resistance to be measured between terminals 1 and 2. Holding coil resistance to be measured between terminals 1 and 3. Plunger length measurement Fig. 61 General view of UVT 71

72 Arc chambers The following describes how to replace arc chambers. 1) Make preparations for parts replacement. Refer to section ) Turn the arc chamber mounting screw eight or ten turns to loosen as shown in Fig. 62. (The arc chamber mounting screws are of captive type and cannot be removed from the arc chamber.) Arc chamber mounting screw (captive) Hexa socket head M6 x 30 (6-8) with spring and flat washers Tightening torque: N m Arc chambers (6-8) Fig. 62 Arc chamber mounting screws 3) Holding the arc chamber mounting screw, remove the arc chamber as shown in Fig. 63. Fig. 63 Removal procedure of arc chamber 4) Reinstall each part or component in reverse order of removal after inspection. Fig. 64 shows a removed arc chamber. Arc chamber mounting screw Arc extinguishing grids Fig. 64 Arc chamber Fig. 64 Arc chamber 72

73 Stationary arc contact and moving arc contact The following describes how to replace the stationary arc contact and moving arc contact. Fig. 65 shows the general view around the stationary arc contact and moving arc contact. Mold base Moving arc contact tip Stationary arc contact Main circuit contact Stationary arc contact tip Stationary contact Moving arc contact Insulated operating rod Moving contact tip Stationary contact tip Moving contact Stationary arc contact mounting screw Hex. socket head M5 x 14 (12-16) with spring and flat washer Tightening torque: N m Moving arc contact mounting screw Hex. socket head M4 x 22 (6-8) with spring and flat washer Tightening torque: N m Fig. 65 General view around the stationary arcing contact 1) Make preparations for parts replacement. Refer to section ) Remove the arc chamber. Refer to section ) Unscrew stationary arc contact mounting screws and moving arc contact screws as shown in Fig 66. Stationary arc contact mounting screw Hex. socket head M5 x 14 (12-16) with spring and flat washer Tightening torque: N m Moving arc contact mounting screw Hex. socket head M4 x 22 (6-8) with spring and flat washer Tightening torque: N m Fig. 66 Stationary contact 73

74 4) Remove the stationary arc contact and moving arc contact shown in Fig 67. Stationary arc contact Moving arc contact Fig. 67 Stationary arc contact and moving arc contact 5) Reinstall moving arc contact according to the following procedures. Put an moving arc contact mounting screw through the installation hole after having put masks between A and B together. (Shown in Fig 68.) Tighten the arc contact mounting screw by torque shown in Fig 66. A installation hole A installation hole B B Fig. 68 State of contacts 6) Reinstall stationary arc contact in reverse order of removal. 7) After installing the moving and/or stationary arc contact, be sure to perform cycles of open/close operation and then retighten the contact mounting screws to the specified torque. Fig. 69 shows the opening distance measuring points of stationary arc contact and moving arc contact. Moving arc contact chip Opening distance measuring points Stationary arc contact chip Fig. 69 State of contacts 74

75 6-2-5 Latch release coil (LRC) The following describes how to replace the latch release coil (LRC). 1) Make preparations for parts replacement. Refer to section ) If the ACB is not equipped with the fixed type undervoltage trip device, turn the cover mounting screws five or six turns to loosen as shown in Fig. 56. If the ACB is equipped with side covers, first remove the side covers and then loosen the front cover mounting screws. (The cover mounting screws are of captive type and cannot be removed from the side and front covers.) 3) Pulling the charging handle down, remove the front cover. 4) Remove the contact block fixing screws as shown in Fig ) Flip the contact block up as shown in Fig ) Turn the LRC mounting screws eight or ten turns to loosen, disconnect the manual connector (green), and then remove the LRC. See Fig. 70. Hand connector (green) LRC mounting screw Pan head M4 x 80 (2) with spring washer Tightening torque: N m Contact block LRC Fig. 70 Removing the LRC 7) Reinstall each part or component in reverse order of removal after inspection. When installing the LRC, make sure the nameplate on the LRC can be viewed from the front of the ACB. Fig. 71 provides the general view of the LRC. Hand connector (green) Plunger LRC mounting screw Moving core (located in the center hole) Coil resistance measuring point Plunger length measurement Fig. 71 General views of LRC 75

76 Shunt trip device (SHT) The following describes how to replace the shunt trip device(sht). 1) Make preparations for parts replacement. Refer to section ) Turn the cover mounting screws five or six turns to loosen as shown in Fig. 56. If the ACB is equipped with side covers, first remove the side covers and then loosen the front cover mounting screws. (The cover mounting screws are of captive type and cannot be removed from the side and front covers.) 3) Pulling the charging handle down, remove the front cover. 4) Remove the contact block fixing screws as shown in Fig ) Flip the contact block up as shown in Fig ) Turn the SHT mounting screws eight or ten turns to loosen, disconnect the manual connector (black), and then remove the SHT. See Fig. 72. Hand connector (black) Contact block SHT mounting screw Pan head M4 x 80 (2) with spring washer Tightening torque: N m SHT LRC Fig. 72 Removing the SHT 7) Reinstall each part or component in reverse order of removal after inspection. When installing the SHT, make sure the nameplate on the SHT can be viewed from the front of the ACB. Fig. 73 provides the general view of the SHT. Hand connector (black) SHT mounting screw Plunger Moving core (located in the center hole) Coil resistance measuring point Plunger length measurement Fig. 73 General view of SHT 76

77 Control relay The following describes how to replace the control relay. 1) Make preparations for parts replacement. Refer to section ) If the ACB is not equipped with the fixed type undervoltage trip device, turn the cover mounting screws five or six turns to loosen as shown in Fig. 56. If the ACB is equipped with side covers, first remove the side covers and then loosen the front cover mounting screws. (The cover mounting screws are of captive type and cannot be removed from the side and front covers.) 3) Pulling the charging handle down, remove the front cover. 4) If the ACB is equipped with the ON-OFF cycle counter, disengage the hook located under the cycle counter spring, turn the cycle counter fixing screw two or three turns to loosen (do not remove), and flip the cycle counter up to the upper right direction. See Fig. 74. ON-OFF cycle counter spring Hook ON-OFF cycle counter (flipped to the upper right ON-OFF cycle counter fixing screw Pan head M5 x 10 with spring and flat washer Tightening torque: N m Fig. 74 Flipping the ON-OFF cycle counter 5) Unscrew the OCR mounting screws and remove the wiring from the wire tie. See Fig. 75. Wire tie OCR mounting screw, Pan head M5 x 12 (2) with spring and flat washers Tightening torque: N m Wiring OCR OCR mounting screw Fig. 75 OCR and related parts 77

78 6) Pull out the OCR as shown in Fig. 76, remove the hand connector(s) above the OCR and place it on the floor. The hand connector(s) below the OCR does not require to be removed. The type and quantity of the hand connectors vary depending on the specification of the ACB. Hand connector OCR Fig. 76 Removing hand connectors 7) Unscrew the contact block mounting screws as shown in Fig. 57 and flip the contact clock up as shown in Fig ) Unscrew relay base mounting screws A and B, raise the relay base to unlatch from other parts, remove the base and place it on the top of the breaker body. To remove relay base mounting screw B, use a ball end type 4-mm Allen wrench. See Fig. 77. When relay base mounting screw A, the relay base ground terminal will also be removed. Relay base ground terminal Relay base Relay base mounting screw A, Pan head M5 12 with spring and flat washers Tightening torque: N m Latch Relay base mounting screw A Relay base mounting screw B, Hex. socket head M5 15 with spring and flat washers Tightening torque: N m Fig. 77 Relay base and related parts 78

79 9) Remove the relay retainer shown in Fig. 78 and remove the control relay from the relay base. Control relay Relay retainer Relay seat Fig. 78 Control relay and related parts 10) Reinstall each part or component in reverse order of removal after inspection. Do not forget to install the OCR ground terminal and the relay base ground terminal. 79

80 Magnet hold trigger (MHT) The following describes how to replace the magnet hold trigger (MHT). 1) Make preparations for parts replacement. Refer to section ) Remove the OCR and the relay base. Refer to items 2-8, section ) Unscrew the MHT mounting screws shown in Fig. 79, disconnect the hand connector (red), and remove the MHT. Hand connector (red) MHT mounting screw MHT mounting screw, Pan head M4 8 (2) with spring and flat washers Tightening torque: N m MHT Fig. 79 Removing the MHT 4) Reinstall each part or component in reverse order of removal after inspection. Fig. 80 provides the general view of the MHT. Hand connector (red) Moving core To remove the moving core, insert a small rod into the center hole on the skew and, holding the rod, lift the core. Moving core stroke measurement Fig. 80 General view of MHT 80

81 Auxiliary switches The following describes how to replace auxiliary switches. 1) Make preparations for parts replacement. Refer to section 6-2-1, 1) and 2). 2) If the ACB is equipped with the control terminal block cover, loosen both the cover fixing screws and remove the cover. 3) Remove the auxiliary switch mounting screws shown in Fig. 81. Auxiliary switches Cover fixing screw Auxiliary switch mounting screw, Pan head M4 x 10 (4-6) with spring and flat washers Tightening torque: N m Fig. 81 Auxiliary switches and related parts 4) Depressing the AUX lock lever shown in Fig. 82, raise the operation lever till a shaft lever (see Fig. 83) appears in the top of draw-out cradle. Operation lever AUX lock lever Fig. 82 AUX lock lever and operation lever 81

82 5) With the operation lever raised, uplift the auxiliary switch unit, pull the shaft lever through the U-notch, and remove the auxiliary switch unit. See Fig. 83. Auxiliary switches Operation lever Shaft lever Fig. 83 Removing the auxiliary switches 6) Reinstall each part or component in reverse order of removal after inspection. When installing the auxiliary switch unit, apply molybdenum grease to the engagement of the operation lever and the shaft lever. Auxiliary contacts can be checked visually through the inspection holes shown in Fig. 84. Auxiliary contact Inspection holes Shaft lever Fig. 84 Checking auxiliary contacts 82